Relative Humidity: range, 20 to 95% RH; resolution, 1% RH; accuracy, ±5% RH within 40 to 80% RH, else ±7% RH. Temperature: range, 32°F to 122°F (0°C to +50°C); resolution, 0.1°F (0.1°C); accuracy, ±2°F (±1°C) from 32°F to 104°F (0°C to 40°C), ±4°F (±2°C) from 104.1°F to 122°F (40.1°C to 50°C). Battery life: 4,000 hrs. continuous. Dimensions (approx.): 5-3/4˝L x 1˝W x 1-1/4˝H.