Wavelength Electronics' WTC3243 temperature controller, suitable for use with thermoelectric devices and resistive heaters, delivers an output current of ±2 A from a +5-V supply. It measures 1.30 x 1.26 x 0.313 in. and provides ultrastable proportional, integral control. The device maintains temperature using an adjustable sensor bias current and an error amplifier circuit. Accessories include demo boards, LabView drivers, heat sinks and fans for high-current operation.