Arroyo Instruments has released the 5230 TECSource temperature controller, which offers 0.004 °C stability when used with the company’s LaserMount or other mounts. The controller provides 3-A/4.5-V (13.5 W maximum) output power to drive package Peltier coolers. Its large vacuum fluorescent display enables reading of measurements from various angles and simultaneously shows current, voltage, and actual and set-point temperatures. After entering the appropriate sensor constants, users can set and display temperature in Celsius, eliminating the need to calculate the sensor resistance. Designed to fit a number of applications, the compact device features USB 2.0 and RS-232 interfaces.