This propagation mat provides bottom heat that enhances germination and rooting. It comes with a digital temperature controller. This seeding and propagation mat is 48 inches long and ideal for placing 2 standard trays end-to-end. It warms the rooting area to 10-20 degrees above ambient temperature. Place it under a 4-foot fluorescent fixture and ensure the bottom surface of your trays will be heated uniformly. Daisy-chain up to 10 mats to reduce the number of power outlets being used and run multiple mats to a single outlet. The heavy-duty construction allows you to use the mat reliably for years on end. The MTPRTC Digital Temperature Controller is new and improved. The 1000-watt heat mat thermostat is digital for greater accuracy. It provides constant optimum temperatures for specific crops and controls the temperature in colder or warmer environments. The MTPRTC has a controllable range of temperature from 68 to 108 degrees Fahrenheit or, for those who prefer the Celsius readout option on the controller, 20 to 42 degrees. This controller is compatible with all heat mats but is optimized for seedling heat mats. The controller comes with an illuminator indicator light and a 3-prong ground plug, making it easy to hook up and use.