Check the listing for details. Grower's Edge Large Display Digital Thermometer & Hygrometer. Color: White, Condition: Used, Made in China. Listed at 10.00 USD. The Grower's Edge Large Display Digital Thermometer & Hygrometer is a reliable tool for monitoring temperature and humidity levels in hydroponic systems. Made of durable plastic in a sleek white color, this thermometer has a compact design with dimensions of 4 inches in length and 3 inches in width. Weighing 6 ounces, it is easy to handle and display in your garden or outdoor space. This innovative device from Grower Edge provides accurate readings to help optimize conditions for healthy plant growth.