Viagrow Heat Mat Thermostat controls the temperature of heat mats by providing constant optimum temperature for plants, seedlings, clones and cuttings. It is ideal for maintaining root zone and rooting temperatures in a propagation tray with humidity dome. Easy plug-in operation with LED indicator light, digital temperature selection with controllable range from 68 to 108 (20-42° C) degrees Fahrenheit. Includes temperature probe with 6' cord Maximum current rating is 8.3 Amps/1000 W. 6ft power cord and probe. Choice of Fahrenheit or Celsius digital readout. Viagrow heat mats and thermostats can be used for a wide array of uses including: reptile and arachnid keeping, heating for enclosures and terrariums, home brewing, maintaining of fermentation temperatures, and brewing of Kombucha tea. With this thermostat, you can easily expand any heat mat's functionality so that it provides the precise level of warmth for your particular needs. The ability to dial in and maintain your preferred temperature means you no longer need to constantly monitor temperature. Will work with all seedling heat mats and recommended heat mats are VSEEDMAT, VSEEDMAT20 and VSEEDMAT48.