Digital Panel-Mount Solar-Powered Thermometer. External Probe on 6-ft Cable. Easy-Read LCD. -50 to 188 °F. Accurately Monitor Temperature in Coolers, Freezers, Incubators, Lab Equipment and More. Solar Powered - No Batteries to Replace! Compact Size - Only 2.6 x 1.2 x 0.6 in. Low Light Requirement - Only 50 Lumens. Wide Temperature Range, -50 to 188 °F. SOLAR-POWERED Digital panel thermometer. Large, easy-read LCD. Requires at least ≥ 50 Lumens for LCD to activate. Remote, NTC thermistor probe on 78-inch lead. Dimensions: 2.6 x 1.2 x 0.6 in (66 x 29.5 x 15 mm). EASY INSTALLATION. Unit panel-mounts into any cut-out measuring 2.3 x 1.0 in (58.5 x 25 mm). Friction clips hold thermometer in place. Probe cable exits from back. Long, 78-inch remote probe cable offers unlimited installation configurations. WIDE MEASURING RANGE: -58 to +230 °F; Resolution: 0.1 °F; Accuracy: ± 1.8 F°. Operating Temperature Range: 41 to 140°F. Measures degrees Fahrenheit only. VERSITILE DESIGN affords unlimited uses. Thermometer body is dust and moisture resistant. Suitable for indoor environment only. The sensor tip and cord are waterproof, immersible in liquid and suitable for monitoring soil temperature. Avoid strong positive or negative pH conditions. IN THE BOX: BNB PT-21 Digital Solar Panel Thermometer with Remote Probe, Instructions.