The TechCheck Model 830 is very easy to utilize and it has multi function calibrator. The TechChek 830 sources and reads like a milliamp or voltage calibrator, as well as simulates and measures T/Cs & RTDs like a temperature calibrator. It also generates and counts frequency and Counts-Per-Minute like a frequency calibrator and displays pressure like a accurate test gauge. It has solid multifuntional calibrator and it has built-in transmitter power supply for continuous powering. It has user settable rapid checks it can store hi, set and lo for instant recall and it has digital accuracy that comes with analog simplicity.