Photo of Oakton Long-Cycle Hygrothermograph

Records temperature and humidity on 1 or 3 month rotation for months of unattended monitoring. Quartz-controlled strip chart drive consistently rotates chart drum even when batteries are weak. Range is 5 to 90% RH with accuracy of ±3% from 10 to 90% RH (1% chart graduations). Temperature range is -20 to 50°C with accuracy of ±1°C (1°C chart graduations). Corrosion-resistant case features a tinted cover for easy viewing. Operates on one C battery for up to six months continuous use. Built-in battery test indicates battery condition with one button press.

Photo of Oakton Three-Speed Hygrothermograph

This sturdy, battery-operated hygrothermograph can record for up to 32 days. Select 1-, 7- or 32-day operation with the flip of a switch. Reads humidity range of 5 to 90% (±3% from 10 to 90% RH). Temperature range is -10 to 50°C (14 to 122°F). Quartz-controlled drive mechanism consistently rotates chart drum even when batteries are weak. Lightweight, corrosion-resistant case for indoor or sheltered outdoor use. A flashing LCD indicates the unit is operational. Included are two C batteries for up to six months of continuous operation-a single button press tests battery condition.

Photo of Oakton® Mini-Drum Hygrothermograph, 7-Day

So economical, you’ll want several for monitoring and recording environmental conditions. This hygrothermograph is compact so it fits almost anywhere. Record temperature and humidity on 7-day rotation. Range is 5 to 90% RH with 5% RH resolution. Temperature range is -6 to 40°C or 22 to 104°F with 2° resolution. Quartz-controlled drive is employed for accuracy; operates for six months on one AA battery. Includes two felt-tipped pens (blue and red), one 7-day rotation chart and one AA battery. Dimensions: 6"W x 7.4"H x 3.9"D. Shipping weight: 4 lbs.