The Reed R2800-NIST is a handheld temperature simulator that electronically generates signals matching 8 thermocouple types (R, S, B, E, K, J, T, N) and 5 RTD types (Pt100, Pt200, Pt500, Pt1000, Cu50), used to verify and calibrate thermocouple and RTD thermometers. It includes internal cold-junction compensation and roughly 0.05% basic accuracy, and comes with a NIST-traceable calibration certificate for documented accuracy in regulated settings.