The Oakton® Thermohygrometer is the only meter in its price range to come complete with probe, calibration salts and carrying case-a complete system for taking accurate relative humidity and temperature readings in lab, field and industrial applications. Dual display lets you see both relative humidity and temperature at a glance. Dew point model calculates and displays dew point at the touch of a button. Two-point humidity auto-calibration. Switchable °F/°C temperature readout. High/low set point alarms sound when temperature or humidity readings are outside of set points. All models feature an analog voltage recorder output-simply connect to a recorder. Use benchtop stand and optional AC adapter for extended relative humidity monitoring. Memory reset allows you to take new maximum and minimum readings. Both meters come in a hard plastic carrying case that includes meter, probe, 33% RH and 75% RH calibration salt bottles, four 1.5 V AA batteries, and operating instructions. Dimensions: 7.5"L x 3.5" W x.1.75"H (meter only). Shpg wt: 4 lbs. Specifications: Humidity: Range: 0 to 99.9% RH, Resolution: 0.1% RH, Accuracy: ±2% up to 95% RH, ±3% from 95 to 99.9% RH. Temperature: Range: 32.0 to 122.0°F (0.0 to 50.0°C), Resolution: ±0.1°C or °F, Accuracy: ±0.6°C/±1.0°F. Dewpoint (H5859-2): Range: –60.0 to 120°F (–51.0 to 49.0°C), Resolution: ±0.1°C or °F, Accuracy: ±2.0°C/±4.0°F.