Considered shock proof, dial indicators with internal shock absorbing features can withstand G impacts of 50 or more without damaging the mechanism. Trustworthy in environments such as heavy machinery maintenance and tower constructions, the hardened steel rack, (58 HRC) and anti-backlash springs, provide accurate readings of 0.01mm resolution. In addition, these products comply with the ASME B89.1.3 standards for Class 1 dial indicators which increases their value in field inspections.