This portable hygrometer thermometer measures indoor humidity and temperature quickly and accurately, helping you adjust humidifiers, dehumidifiers, and humidistats. It is ideal for monitoring home environments to support health by reducing risks associated with dry air, colds, asthma, and mold. The device provides fast readings in approximately 10 seconds, with updates every 24 hours. It features a wide measurement range: temperature from 0.0°C to 50.0°C and humidity from 10% to 99% (allow for a small margin of error). Temperature is displayed in Celsius only. The unit has a bright black front panel with a clear LCD display for easy reading, even from a distance. Specifications: - Humidity accuracy: ±5% RH - Humidity resolution: 1% RH - Temperature accuracy: ±1°C - Temperature resolution: 0.1°C - Panel cutout size: Diameter 42mm - Operating voltage: 1.5V (one LR44 button cell battery) - Color: Black - Material: ABS plastic - Dimensions: 45 x 15.5mm Package includes: 5 x Digital hygrometers 5 x LR44 button cell batteries