Honeywell 135 Ohm, Proportional Thermostat, 56 F to 84 F w/ auxiliary switch that closes on temperature rise

Proportional Thermostats provide low voltage, 3-wire control for valve motors, damper motors, and balancing relays in heating or cooling system applications. Product Features: Bellows element adjusts potentiometer slider to regulate motor operation. Removable setting knob prevents unauthorized tampering with setpoint. 135 Ohm, Proportional Thermostat with auxiliary switch that closes on temperature rise, 56 F to 84 F Product Specifications: Output Signal: 135 Ohm potentiometer Setpoint Temperature Range (F): 56 F to 84 F Mounting: Wall mount Throttling Range: 1.4 C Dimensions: 5 11/16 in. high x 3 3/8 in. wide x 2 1/4 in. deep Includes: Tradeline model which includes slotted sides and an add-on faceplate to allow thermostat to be mounted horizontally.