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A hygrometer calibration unit consists of a large water reservoir, a diffusion tube and a cell through which the gas is passed. It operates at moisture levels up to 1,000ppm and functions accurately at discreet levels of, say 1,5, and 10ppm. It operates on most gases. Price is £39. Delivery is 3 to 4 weeks.
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© MCB UP Limited
1972
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