These indicators come with a calibration certificate traceable to NIST that states they’ve passed a test for accuracy. They have a larger display than other Mitutoyo electronic indicators for easier reading. A spring-loaded plunger retracts and extends to measure objects. The go/no-go operation indicates when measurements fall outside your set tolerance. All have zero-position memory, also known as absolute (ABS) positioning, which retains the measuring position when the indicator is off. A zero-set button lets you start measuring at any point. SPC data output allows for connection to a computer or data processor.