This is the NIST-certified version of REED's R2815 calibrator, sourcing and measuring 11 thermocouple types and 5 RTD types along with DC voltage and resistance, and it ships with a traceable NIST calibration certificate documenting full data and uncertainties. It shares the same 6-digit backlit LCD, internal cold-junction compensation, zero-adjust button, and built-in LED flashlight as the standard model, along with a kickstand and magnetic hanger for hands-free bench or field use. Powered by 3 AA batteries with roughly 20 hours of runtime and auto shut-off, it's suited for labs and technicians who need documented calibration traceability.