The heat mat thermostat is digital for greater accuracy. The stainless steel temperature probe can be submerged in water. Digital temperature controller for heat mats. Provides constant optimum temperatures for specific crops. Controls temperature in colder or warmer environments. Illuminated indicator light; 3-prong ground plug. Compatible with all heat mats; optional for ++farm Heat Mats. Controllable range from 68 - 108 Fahrenheit. Celsius or Fahrenheit read-out (hold Up or Down button to change). Max current: 8.3 amps / 1000 watts.