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Cassella Thermohydrographs 

Cassella is a name which has long been associated with the highest quality precision instruments for measuring and recording temperature and humidity. A service life of twenty years may be expected from this equipment, which is powered by a 1.5 volt battery. These Thermohydrographs will provide a continuous record of temperature and relative humidity levels on a single rectangular chart which is wrapped around a slowly moving drum. Select daily or weekly rotations from stock or monthly models may be special ordered. Cassella thermohydrographs are spring-driven and have quartz clock mechanisms. The standard model features robust white-enameled aluminum alloy die-casting with cast aluminum side guards. The deluxe model is no longer available, though charts and replacement parts for it are still offered. A leaflet is available upon request. Technical specifications follow.




Temperature: Deluxe +/- 2% Standard +/- 1% of the full scale

Humidity: +/- 3% between 20% and 80% RH

Sensitivity: 1 = 1.64mm/1% RH - 0.82 mm

Daily clock: 25 hour/11.25 mm per hour

Weekly clock: 168 hour/1.6 mm per hour


Unit measurements: 11-3/4 x 6-1/2 x 5-3/4 inches, 1-1/2 lbs.


Item #




Standard Model, daily/ weekly rotation



Box of 200 charts (standard, daily, 0-50 C)



Box of 200 charts (standard, weekly, 0-50 C)



Box of 200 charts (deluxe, daily, 0-50 C)



Box of 200 charts (deluxe, weekly, 0-50 C)



Package of 2 spare humidity pens (red)



Package of 2 spare temperature pens (black)


B8270 / 4

Humidity element