ISO/IEC 17025:2005 Accredited Calibration Services
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Thermometers and Hydrometers may need to be recalibrated. Does yours?

Properly calibrated instruments are required to adhere to laboratory SOP's. Shock, contamination and other factors can cause drift from accepted values. In general laboratory use, it is recommended that you recalibrate liquid in glass thermometers at one year intervals. NIST further recommends six month intervals for liquid in glass thermometers used as standards. Other factors to consider in determining recalibration intervals include SOP's, calibration history, measurement assurance data, data for the population of similar equipment, and statistical analysis methods. This would apply to hydrometers as well.

NIST Publication GMP-11, Good Measurement Practice for Assignment and Adjustment of Calibration Intervals for Laboratory Standards, establishes calibration intervals for standards and instrumentation used in measurement processes. NIST guidance documents are available on their website.



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When Accuracy Counts

  • A2LA accreditation in accordance with ISO/IEC 17025:2005 covering the scope of liquid in glass, electronic and bi-metal thermometers and proof, specific gravity, Baume heavy and light and American Petroleum Institute Scale hydrometers, timers, stopwatches, hygrometers and barometers
  • Test procedures of NBS Monograph 150 and 174 and ISO 17025 as guidelines
  • Quality standards meeting ISO 9001:2008 and ISO/IEC 17025:2005 through A2LA, ANSI/NCSL Z540-1 criteria
  • Individual calibration to NIST  standards

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What is Calibration & When Is It Needed?

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