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| Michell Instruments |
The Optidew Transportable dew-point hygrometer (photo) combines the drift-free performance of the chilled-mirror principle with the convenience of a transportable instrument. Housed in a specially designed case, the device is both fully self-contained as well as small and lightweight. The instrument offers a wide measurement range from the equivalent of less than 0.5 up to 100% relative humidity, and measures dew points as dry as –40C at ambient temperatures. — Michell Instruments, Ely, Cambridgeshire, U.K.