A SIMPLE REMINDER
Even well-regarded brand name dial indicators typically have a +/- accuracy equal to 1X to 2X their resolution and can read +/- 0.0005″ after 2 to 3+ revolutions. For example, a Mitutoyo 0.5″ range, 0.0001″ resolution indicator has a factory stated accuracy of +/- 0.0002″, and a 1st revolution error of +/- 0.0002″. This +/- error increases with each additional revolution to as much as +/-0.0005. Almost all dial indicators are most accurate during their first half revolution. Good stuff to know when using an indicator.

Eric and Tom Nichols
AMS – Moto Machine & Supply
Cleburne, TX
April, 2024