This compact, programmable combined sensor and controller is designed to mount directly to MA Series heat exchangers and is a low-cost alternative to complex control systems. It provides accurate temperature control by cycling the electric cooling fan to maintain desired oil temperature. A single housing reduces wiring and mechanical installation. The MAGHEX magnetic wand is used to set up and program the sensor. LEDs indicate the oil temperature setting. The MAGHEX operates as either a single or dual fan controller or a PWM variable fan controller. Includes pre-wired connector to fan.