Digital Temperature Humidity Meter - Hygrometer and Thermometer for Greenhouse and Hydroponics TH-812 Digital Temperature and Humidity Measurement for Hydroponics, Gardening, Greenhouse Extra large LCD display for easy reading from across the room Measuring Range: 10% - 95% RH Relative Humidity, 14 - 140 F / -10 - 60C Great for greenhouse, grow areas, orchid growers and gardeners Battery: 1x AA is included and will last approx 3 years