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Long-Cycle Hygrothermograph from Oakton Instruments

USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 -

USA Toll Free: 1-800-730-0302 Tel: 416-240-1920 -

Long-Cycle Hygrothermograph

Eutech pH 200 Controller, Oakton InstrumentsRecord up to 3 months of humidity and temperature readings on one chart!

  • Record temperature and humidity on 1 or 3 month rotation

  • Quartz-controlled strip chart drive consistently rotates chart drum even when batteries are weak

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.

Long-Cycle Hygrothermograph product bulletin
Long-Cycle Hygrothermograph manual

Humidity Range 5 to 90% RH
Humidity Accuracy ±3% from 10 to 90% RH; ±5% from 5 to 10% RH
Humidity Chart range 0 to 100% RH
Humidity Chart graduations 1% RH
Temperature Range -20 to 50°C
Temperature Accuracy ±1°C
Temperature Chart graduations 1°C
Chart size 6.6"H x 114" L (16.8 x 290 cm)-one month 6.6"H x 300"L (16.8 x 762 cm)-three months
Chart rotation 1 month (38 day max) or 3 month (100 day max)
Power one C battery (included)
Dimensions 13.3" x 11.5" x 5.1" (33.8 x 29.2 x 13 cm)
Shipping weight 9 lbs (4 kg)



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Metex Corporation Limited has been providing superior products and services to the process control, chemical treatment, waste water, industrial and manufacturing industries for over 25 years. It is our goal to continually provide our customers with the best possible equipment, technology, and service.


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