The Reed R5850 is a rugged multifunction process calibrator that both sources and measures volts, mA, ohms, frequency, and a wide range of thermocouple (12 types) and RTD (10 types) signals. A high-resolution display lets technicians view input and output simultaneously, while built-in auto-step and auto-ramp routines speed up linearity testing. It includes a 24V loop supply for transmitter testing, a rechargeable battery pack, and onboard memory to store frequently used setups.