The Measure of Quality
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  • Calibration is the high-level, controlled and documented process of measuring traceable calibration standards over the full operating range of the instrument or probe, and verifying that the results are within the stated accuracy. Calibrations are performed by the manufacturer, their authorized agent, or by an accredited calibration laboratory in a controlled environment using a documented process.


  • A Certificate of Calibration is a document generated by trained technicians in a controlled environment using a documented process. Manufacturers use them to certify that the subject instrument was tested on standards traceable to a National Metrology Institute such as NIST or PTB and found to comply with all applicable specifications.
  • Our Long Form (full data) Certificates include instrument or probe model number, probe serial number, reference and actual measurements, traceability to NIST or PTB, laboratory temperature and relative humidity, management procedure, inspector's signature and calibration date. Many other suppliers provide only a Short Form document, sometimes known as a Certificate of Compliance, which usually doesn't include measurement values.


  • Long Form (full data) Certificates are valuable documents usually required by companies who are compliant to international standards such as ISO 9000 and ISO 17025. If you need documentation that the instrument has been tested prior to shipment, it is provided by this Certificate.


  • DeFelsko does not provide or suggest expiration dates. Time intervals for recertification are determined by the customer. While many companies send their gages in for annual certification, the frequency should be based on your customer's internal quality guidelines and policy. Four primary factors that should influence the interval decision are:

    1. How frequently the gage is being used

    2. The physical condition of the gage

    3. The application being measured

    4. The environment, storage and handling practices

DeFelsko recommends customers establish calibration intervals based upon their own experience and work environment. A gage used frequently, roughly, or over abrasive surfaces may require a shorter certification interval than a gage used less frequently and handled with care. Based on our product knowledge, data and customer feedback, a one year certification interval from either the date of calibration, date of purchase, or date of receipt is a typical starting point.


  • Recertification cost varies by product type; between $95 and $145.
  • Turn around time for recertification is (1) day for all instruments with the exception of PosiTector DPM dew point meters which can take up to (5) days.


  • All measurement electronics and functionality reside in the probe. This feature allows for complete interchangeability between gage bodies and probes. The probe is the true instrument inspected and certified by our calibration lab.
  • For companies with a single PosiTector body and probe, we recommend to use the probe serial number for both as it is by far the most critical. Then the unit can be treated as one instrument with full traceability through the serial number engraved on the probe.


  • Yes. Purchase a set of Verification Standards and verify gage calibration at your own convenience using our written Calibration Procedures. This is cost-effective for customers who have numerous gages or require frequent verification.


  • It is more economical to trade-in Standards for a new set. Trade-in reduces the price of new Standards by 20%.

    Certified Standards should be replaced whenever they become visibly worn or scratched.



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