The WTC32ND Temperature Controller drives up to 2.2A to Thermoelectrics or Resistive Heaters, with ultrastable PI control and 0.0009°C temperature stability. It is compatible with thermistors, RTDs and IC sensors. Features include heat and cool current limits and adjustable sensor bias current. The robust and reliable WTC32ND is designed into handheld electro-optical systems, eye-safe atmospheric lidar, airborne instrumentation, Raman spectrometers and medical diagnostic equipment. It is particularly suited to applications where temperature is scanned across ambient.