Arroyo Instruments’ 5300 series temperature controllers offer 60 and 120 W of thermoelectrically cooled control power in a compact 2U half-rack enclosure. They feature 0.004 °C stability, 12-V compliance and digital PID control. Thermistor, RTD, LM335 and AD590 sensor inputs are supported. The user interface has a bright vacuum fluorescent display. The controllers have both USB and RS-232 interfaces for computer control and are command-set compatible with other temperature controllers. An adjustable 4- to 12-VDC power supply is included for powering fixture-based fans. Operating temperature range is from –99 to 250 °C, and resolution is 0.01 °C.