The Tecpel CL-420 is a process calibrator that is a flexible, high precision, battery operated and extremely durable hand-held process calibrator permits process technicians to reproduce and source variables signals with 0~22mA, 0~28V. It has a loop power 24V that are mostly utilized in calibration for industrial field and laboratory implementation. This is one of the main requirement tools utilized to measure and calibrate industrial automation systems and instruments. It has a durable and simple to utilize design with battery status display indicator and can power and read a transmitter at the same time. With 25% push button steps for simple and quick linearity check 24V internal loop supply.