The REED R5805-NIST is a handheld voltage and current source used to bench-test meters, controllers, and sensor loops. It outputs roughly -1 to 11V DC and 0 to 30mA DC with a large 6-digit backlit LCD, a kickstand for hands-free use, and a built-in LED flashlight, and runs about 20 hours on 3 AA batteries. This unit ships with a NIST-traceable calibration certificate for documented accuracy.