Calibration Service Selection
Compare NABL calibration quotations by scope, range, CMC, uncertainty, certificate needs, turnaround, logistics, and total service cost.
NABL Calibration Services: How to Evaluate Quotations Beyond Price
Evaluating calibration quotations involves more than comparing the amount stated on each quotation. A proper comparison should consider technical coverage, the relevant NABL scope, measurement range, calibration measurement capability, measurement uncertainty, certificate requirements, turnaround time, transportation, technical assistance, and the overall service expense.
Contents
- Verify the NABL scope of accreditation
- Make sure your instrument is covered
- Review the measurement range and CMC
- Compare measurement uncertainty
- Laboratory calibration versus on site calibration
- Examine the calibration certificate
- Compare turnaround times
- Verify pickup and delivery
- Discuss technical support
- Work out the total cost
- Apply a consistent comparison process
- Questions to ask before placing an order
- How to select the final laboratory
- Frequently asked questions
Verify the NABL scope of accreditation
Begin by checking the laboratory's current NABL scope of accreditation. A calibration laboratory may list many instruments and services in its general service portfolio, but its accredited scope specifies the particular calibration activities for which competence has been demonstrated.
NABL states that an accreditation scope identifies the specific tests or calibrations for which a laboratory has been assessed as competent. The scope may contain information such as applicable methods, measurement ranges, and calibration measurement capability (CMC). NABL also indicates that a laboratory's accreditation does not automatically extend to capabilities that are not included in its approved scope.
For this reason, the scope document can provide a more reliable basis for quotation comparison than a general list of services published on a website.
NABL states that an accreditation scope identifies the specific tests or calibrations for which a laboratory has been assessed as competent. The scope may contain information such as applicable methods, measurement ranges, and calibration measurement capability (CMC). NABL also indicates that a laboratory's accreditation does not automatically extend to capabilities that are not included in its approved scope.
For this reason, the scope document can provide a more reliable basis for quotation comparison than a general list of services published on a website.
Check the details that apply to your requirement
- Instrument type or category
- Calibration parameter
- Applicable range or nominal value
- Calibration method or reference
- Calibration measurement capability
- Relevant discipline and group
- Laboratory or site calibration status, where applicable
Practical check:Request the laboratory to point out the exact entry in its current NABL scope that covers the calibration you require. Save this information along with the quotation and purchase documentation.
NABL provides a laboratory search facility through its website. Its FAQ also explains that users can search for accredited laboratories and review their accreditation scopes to examine parameters, methods, ranges, and calibration capability.
Make sure your instrument is covered
Simply matching the instrument category does not establish complete technical coverage. Instruments belonging to the same broad category may differ in range, parameter, resolution, configuration, or intended use.
Provide complete instrument details when requesting a quotation. This helps the laboratory assess whether the requested calibration falls within its available capability.
- Instrument type
- Manufacturer
- Model number
- Serial number
- Capacity or measurement range
- Resolution
- Required calibration parameter
- Any customer or quality-system requirement
When an instrument contains multiple measurement functions, identify each function that needs calibration. A quotation covering one parameter should not automatically be interpreted as covering all functions of a multifunction instrument.
Review the measurement range and CMC
The measurement range is an important technical factor that can influence whether a calibration service is appropriate.
For instance, an instrument may be designed to measure a particular dimensional quantity, pressure, temperature, electrical parameter, mass, or another physical quantity. A laboratory's general ability to calibrate a particular instrument category does not by itself demonstrate that the requested measurement point falls within its accredited capability.
Review the relevant range or nominal value in the laboratory's current scope. You should also examine the CMC stated for the applicable calibration.
CMC, or Calibration and Measurement Capability, forms part of the technical information provided within an accreditation scope. It should be assessed together with the measurement requirement and the uncertainty associated with the reported calibration result.
Avoid relying on an unclear confirmation such as "Yes, we calibrate this instrument." A stronger technical confirmation identifies the applicable scope, range, and capability for the requested calibration.
Compare measurement uncertainty
Measurement uncertainty is important when interpreting calibration results. It should therefore be included when comparing the technical suitability of different calibration quotations.
Ask each laboratory to specify the measurement uncertainty applicable to your requested calibration and confirm how it will be presented on the calibration certificate.
A laboratory advertising a smaller uncertainty is not automatically the best choice for every application. The more useful evaluation is to compare the uncertainty associated with the calibration against the measurement requirements of your instrument and process.
Match uncertainty with your measurement requirement
Consider an inspection process with a specified tolerance of ±0.10 mm. The person responsible for the measurement system should understand the uncertainty associated with calibration before determining whether the available measurement information is suitable for the intended assessment.
The same consideration applies to electrical, temperature, pressure, mass, force, torque, dimensional, and other measurement applications. The required calibration capability depends on the purpose for which the instrument is used and the way its measurement results will be evaluated.
If your quality procedure establishes a particular uncertainty or measurement capability requirement, include that requirement in your request for quotation. This allows different laboratories to respond to an equivalent technical specification.
Laboratory calibration versus on site calibration
The calibration location can influence the overall expense, equipment downtime, transportation requirements, and service conditions.
Laboratory calibration generally involves removing the instrument from production or inspection activities and transporting it to the calibration facility. On site calibration may be suitable when moving the instrument is difficult or when minimizing equipment downtime is important.
NABL requirements for site calibration include identification of applicable site calibration activities within the relevant scope. Therefore, when NABL accredited on site calibration is required, the specific scope should be examined.
For on site calibration, confirm the following
- Whether the laboratory provides on site calibration for your instrument
- Whether the requested activity falls within the applicable accredited scope
- Travel expenses
- Mobilization expenses
- Environmental conditions required at the site
- Site access requirements
- Availability of required power and utilities
- Requirements for equipment or reference standards
Ask the laboratory to clearly identify whether the quoted work will be performed at its laboratory or at your site. Keep this information in the purchase order or other service documentation.
Examine the calibration certificate before ordering
The calibration certificate is one of the main deliverables included in the service. If your quality system has specific documentation requirements, request a sample certificate or certificate format before accepting the quotation.
Information to examine
- Customer identification
- Instrument identification
- Manufacturer and model
- Serial number or another unique identification
- Calibration results
- Measurement uncertainty
- Traceability information, where applicable
- Calibration method or reference
- Environmental conditions, where relevant
- Applicable accreditation information
- Statement of conformity, when requested and appropriately defined
Certificate requirements can vary between organizations. A manufacturing organization may have documentation expectations that differ from those of a testing laboratory, customer, regulator, or certification organization.
When NABL accredited calibration is required, confirm that the requested calibration activity falls within the relevant accredited scope and that the certificate will present the accreditation information in the required form.
Compare turnaround times
The calibration charge represents only one part of the operational impact. The period during which an instrument remains unavailable can influence inspection, testing, maintenance, and production activities.
Request the standard turnaround time from each laboratory before placing an order. If your organization needs the instrument returned by a particular date, communicate that requirement when requesting the quotation.
Ask about expedited calibration
If the laboratory offers an urgent calibration service, confirm the additional fee and expected completion period. Where appropriate, document the agreed turnaround time in the purchase order or service confirmation.
Consistent turnaround-time comparisons are particularly useful when two laboratories offer similar technical coverage but differ in service schedules.
Verify pickup and delivery
Transportation arrangements can influence both the overall price and the handling requirements associated with calibration.
Before dispatching an instrument, determine who will handle collection, packaging, transportation, and delivery. For instruments that may be affected by shock, vibration, temperature, or other environmental factors, follow the manufacturer's handling instructions or your organization's applicable procedures.
- Pickup availability
- Delivery availability
- Transportation charges
- Packaging requirements
- Expected collection date
- Expected delivery date
- Responsibility during transportation
- Special handling requirements
Keep logistics expenses separately identified during quotation evaluation. A laboratory offering a lower calibration fee may charge additional amounts for transportation, pickup, delivery, or handling.
Discuss technical support
Clear technical communication before ordering can reduce misunderstandings about the requested service.
Ask the laboratory to explain the applicable scope, calibration method, measurement uncertainty, certificate requirements, and reporting procedure. If the instrument has an unusual configuration or your customer has a specific requirement, provide those details before the quotation is finalized.
Ask what happens when an instrument is out of tolerance
Your purchasing and quality teams should understand the laboratory's procedure when calibration results show that an instrument does not satisfy the required acceptance criteria.
Determine whether the laboratory will report the condition and wait for further instructions, perform adjustment when available, offer repair services, or follow another agreed procedure. Do not assume that adjustment or repair is automatically included in the calibration charge.
Also determine whether an adjustment or repair affects the calibration status and whether the instrument must undergo another calibration afterward.
Work out the total cost
Compare the final applicable service cost instead of focusing only on the initial calibration price shown on the quotation.
Depending on the service arrangement, additional charges may be added to the basic calibration fee.
- Calibration fee
- GST or other applicable taxes
- Travel charges
- Transportation
- Handling
- Mobilization
- Site charges
- Expedited service
- Adjustment or repair, when separately charged
- Other stated service charges
Request a detailed cost breakdown whenever a charge or service item is unclear.
Consider a simple comparison. Laboratory A may offer a lower basic calibration price but charge separately for pickup and handling. Laboratory B may quote a higher calibration fee while including those services. The appropriate comparison is based on the final applicable cost for an identical service requirement.
Purchasing rule:Evaluate quotations only after confirming that both laboratories have priced the same technical scope, certificate requirements, calibration location, turnaround requirement, and logistics arrangement.
Apply a consistent comparison process for every laboratory
A standardized comparison sheet can make quotation evaluation more straightforward. Ask the same questions of every laboratory and document the responses instead of making decisions based only on general impressions.
| Comparison point | Laboratory A | Laboratory B |
|---|---|---|
| NABL scope coverage | Confirm | Confirm |
| Specific instrument coverage | Confirm | Confirm |
| Required parameter | Record | Record |
| Measurement range or capacity | Record | Record |
| CMC | Record | Record |
| Measurement uncertainty | Record value | Record value |
| Calibration location | Laboratory or site | Laboratory or site |
| Certificate format | Review sample | Review sample |
| Traceability information | Confirm | Confirm |
| Standard turnaround | Record | Record |
| Expedited service | Confirm | Confirm |
| Pickup and delivery | Confirm | Confirm |
| Out of tolerance process | Confirm | Confirm |
| Adjustment or repair | Confirm | Confirm |
| GST and taxes | Included or extra | Included or extra |
| Transportation | Included or extra | Included or extra |
| Total applicable cost | Calculate | Calculate |
Build a quotation evaluation scorecard
A scorecard can assist purchasing and quality teams in separating mandatory technical conditions from commercial considerations.
Begin by determining which requirements are compulsory. For example, if a customer requires calibration under a particular accredited scope, scope coverage should be considered a qualification condition rather than something that can be exchanged for a lower price.
The same method can be applied to certificate requirements, measurement capability, uncertainty requirements, and on site calibration conditions.
| Area | What to verify | Evidence to keep |
|---|---|---|
| Accreditation | Applicable NABL scope | Current scope document or laboratory scope reference |
| Technical coverage | Instrument, parameter, and range | Written confirmation and scope reference |
| Capability | CMC and measurement uncertainty | Scope information and quotation |
| Documentation | Certificate content | Sample certificate or agreed format |
| Service | Location and turnaround | Quotation and service confirmation |
| Logistics | Pickup, delivery, and transportation | Quotation terms |
| Commercial | Total applicable cost | Final quotation |
Maintaining these records can also simplify future supplier assessments because the basis for the purchasing decision remains documented.
Questions to ask before placing an order
- Is my specific instrument included in your current NABL accredited scope?
- Does your scope cover the calibration parameter I require?
- Does the scope include my measurement range, capacity, or nominal value?
- What CMC applies to the requested calibration?
- What measurement uncertainty will be reported?
- Will the calibration be carried out at your laboratory or at my facility?
- If the calibration is performed on site, is the requested activity covered by the applicable scope?
- Can you provide a sample calibration certificate?
- Will the certificate contain the information required by my quality system?
- What traceability information will be supplied?
- What is your standard turnaround time?
- Do you provide expedited calibration?
- What additional fee applies to expedited service?
- Do you offer pickup and delivery?
- Are transportation and handling charges included?
- What procedure is followed if the instrument is found to be out of tolerance?
- Are adjustment or repair services available?
- Are adjustment and repair included in the quoted calibration price?
- Does the quotation include GST and other applicable charges?
- What is the final estimated cost for the complete requested service?
How to select the final laboratory
Begin the evaluation with technical eligibility. If a quotation fails to satisfy a mandatory calibration requirement, a lower price should not be used to justify selecting that service.
After confirming technical suitability, compare the laboratory's measurement capability and uncertainty against your actual application. Examine the certificate format and documentation requirements before approving the service.
Once the technical conditions have been satisfied, compare turnaround time, logistics, and the final applicable cost.
Keep the quotation, scope reference, technical correspondence, and final purchasing conditions together. This provides a documented record of the requested service and the laboratory's agreed responsibilities.
A well-prepared calibration quotation should provide enough information to establish whether the laboratory can perform the requested calibration, whether its documentation meets your requirements, and what the complete service will cost. Price becomes a useful comparison factor only after these requirements have been evaluated on an equivalent basis.
Frequently asked questions about NABL calibration quotations
What should I check first in a NABL calibration quotation?
Start by examining the laboratory's current NABL scope and confirming that it covers your specific calibration requirement, including the relevant instrument, parameter, range or nominal value, and applicable capability. After that, review the certificate requirements and commercial terms.
Does a NABL accredited laboratory automatically have NABL coverage for every instrument it calibrates?
No. NABL accreditation applies to the activities included within the laboratory's approved scope. NABL explains that capabilities outside the listed scope are not covered by that laboratory's NABL accreditation.
How can I verify a calibration laboratory's NABL accreditation?
Use the NABL laboratory search facility and access the laboratory's accreditation scope. Check the relevant discipline, group, calibration parameter, range, and capability before ordering the service.
What is CMC in calibration?
CMC stands for Calibration and Measurement Capability. It is technical information included in applicable accreditation scopes and should be considered when determining whether a laboratory's capability is appropriate for a particular measurement requirement.
Why is measurement uncertainty important when comparing calibration laboratories?
Measurement uncertainty influences how calibration results should be interpreted. Compare the uncertainty associated with the requested calibration with the requirements of your measurement process, acceptance criteria, and quality system.
Is on site calibration covered by NABL accreditation?
It may be covered when the applicable site calibration activity is included in the laboratory's accreditation scope. NABL's site calibration criteria indicate that accredited site calibration activities are identified within the scope. Verify the specific activity before placing an order.
Should I request a sample calibration certificate?
Yes. Reviewing a sample certificate allows you to check details such as instrument identification, calibration results, uncertainty, traceability information, method references, and accreditation information before the service is performed.
What should be included when comparing calibration prices?
Compare the complete applicable cost. This can include calibration, taxes, transportation, handling, travel, mobilization, site charges, expedited service, and separately charged adjustment or repair work.
What happens if an instrument fails calibration?
The response depends on the laboratory's procedures and the agreed service terms. Confirm beforehand how an out of tolerance condition will be reported and whether adjustment or repair is available. Also determine whether another calibration will be required after adjustment or repair.
What information should I provide when requesting a calibration quotation?
Provide the instrument type, manufacturer, model, serial number, capacity or range, resolution, required calibration parameter, and any specific quality-system or customer requirement. Supplying complete information helps reduce uncertainty when the laboratory evaluates technical coverage.
Final checklist for purchasing teams
- Verify the laboratory through the NABL accredited laboratory search.
- Access the current accreditation scope.
- Match the instrument and calibration parameter with the scope.
- Check the applicable range or nominal value.
- Review the CMC.
- Confirm measurement uncertainty.
- Establish whether calibration will be performed in the laboratory or on site.
- Review a sample certificate.
- Confirm traceability and documentation requirements.
- Record the standard turnaround time.
- Check expedited service conditions when required.
- Confirm pickup, delivery, and transportation arrangements.
- Establish the procedure for out of tolerance results.
- Separate calibration charges from adjustment or repair charges.
- Calculate the complete applicable cost.
- Retain the technical and commercial comparison with the purchasing record.
Technical references
The NABL-related information in this article is based on publicly available material from the National Accreditation Board for Testing and Calibration Laboratories, including information concerning accreditation scopes, the NABL FAQ, and site calibration criteria. Requirements may change, so the current NABL scope and applicable NABL documents should be checked before making a purchasing or compliance decision.
Primary reference:National Accreditation Board for Testing and Calibration Laboratories (NABL), Accreditation Process & Scope.
Additional reference:NABL FAQ, including information about searching accredited laboratories and reviewing their accreditation scopes.
Additional reference:NABL 130, Specific Criteria for Site Testing and Site Calibration Laboratories.
General laboratory competence reference:ISO/IEC 17025:2017, General requirements for the competence of testing and calibration laboratories.
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