Ans: 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.

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

Ans: 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.

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

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