Frequently Asked Questions

What is Traceability?

As defined by NIST, “Traceability requires the establishment of an unbroken chain of comparisons to stated references.” Essentially, traceability is documentation showing a link to a known standard. This master standard can then be used to certify another vessel’s accuracy relative to that known standard.

In the USA, national standards for weights and measures are maintained by the National Institute of Standards and Technology. Most countries have their own institutes for maintaining standards, all which can be linked to international BIPM laboratories in France. The Bureau International des Poids et Mesures (BIPM) was set up by the Convention of the Metre and has its headquarters near Paris. It is financed jointly by the Member States of the Convention and operates under the exclusive supervision of the CIPM. Its mandate is to provide the basis for a single, coherent system of measurements throughout the world, traceable to the International System of Units (SI)

Regulatory Organizations


USA National

What is NVLAP?

NVLAP is the National Voluntary Laboratory Accreditation Program. For more information about NVLAP click here

My sight glass is broken and I need a new one, how do I determine what size I need?

Click on the link below for detailed instructions on how to determine what size sight glass you need.

How to Determine the Size of your Sight Glass

Test Measure FAQ

What is difference between a long neck and a short neck test measure?

A long neck has a gauge assembly that starts at the top of the neck and ends at the bottom of the neck and a short neck has a gauge assembly that starts at the top of the neck and end in the cone of the test measure.

How do I change a gauge tube and do I have to have my test can re-calibrated?

A Seraphin® test measure is manufactured so that you if you clean or change your gauge tube correctly you do not have to re-calibrate your test measure.

How often and where can I get my test measure re- calibrated?

NIST handbook 105-3 recommends that a test measure be re-calibrated annually, no longer than 3 years.