Treat your seedlings in a temperature-controlled environment that's easy to adapt with the JUMP START Hydrofarm 48 in. x 20 in. Seedling Heat Mat and Digital Thermostat Controller. This hydroponic mat's heating wire and thicker multi-layer construction offer more uniform heating and the durability to withstand rugged greenhouse environments. The Hydrofarm Seedling Heat Mat is the only UL Listed seedling heat mat on the market. This Hydrofarm Seedling Heat Mat warms the root area raising the ambient temperature 10°F to 20°F to improve germination, and has lighting, watering, and planting information printed on the mat. The waterproof construction with rugged and durable waterproof connectors means you don't have to worry about splashing when watering your plants. This Digital Thermostat Controller has a controllable range of temperature from 68°F to 108°F or 20°C to 42°C. This controller is optimized for Hydrofarm 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, and is ETL certified. Provide a warm environment and get an exact temperature reading on all your crops with the JUMP START Hydrofarm 48 in. x 20 in. Seedling Heat Mat and Digital Thermostat Controller.