Long-Cycle Hygrothermograph from Oakton Instruments
Record up to 3 months of humidity and temperature readings on one chart!
Unit features a corrosion-resistant acrylic plastic case with 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 a button press. Unit includes red and blue pens, battery, and one roll of 1-month chart paper.