Seedling heat mats provide bottom heat that is proven to increase the speed of root formation on cuttings and the germination of seeds. Keep seedlings at an optimal temperature with precision using the Seedling Warmer Thermostat designed to work with all sizes of seedling warmers. Seed warming mats will work without the Thermostat, but the minimum and maximum temperatures cannot be set. So the thermostat adds a bit of precision, and is recommended for commercial operations that need to keep careful control of greenhouse systems. The Seedling Warmer Thermostat works with any seedling warmer to keep seedlings at an optimal temperature between 20-42°C (68-108°F). The thermostat includes a temperature probe on a six foot cord and digital control to maintain optimal rooting temperature for faster seedling or cutting growth. The LED display will indicate in Celsius or Fahrenheit. Max current: 8.3 amps/1000 watts.