Temperature Humidity Meter - Hygrometer for Hydroponics, Greenhouse, Gardening Indoor Temperature and Humidity Measurement for Hydroponics and Gardening Large 1 inch tall numbers on the LCD display - easy to read Measuring Range: 10% - 95% RH Relative Humidity, 14 to 140 F / -10 to 60C Great for greenhouse, grow areas, orchid growers and gardeners Battery: 1x AA is included and will last about 3 years