The TechChek can be taken to all sites and that can easily lighten your load. This device is just like having a cartload of test equipment in the control room or the field. It has a functionality that is like a calibrator for milliamps, RTD, T/C, Voltage, and the Frequency. It functions in the same way a multi-meter measures AC/DC Volts, Continuity, and Ohms. for faster adjustment users can expect digital accuracy with the simplicity of analog speed and a sensitive digital pot. The menuless operation is not only simple it is easy to use. Set any span and zero with the user settable Quick-Chek Switch. Instantly recall the lowest and highest measurements with minimum and maximum tracking. The device uses standard AA Alkaline Batteries. With quick battery changes there is a long battery life.