Mason's Hygrometer Hanging pattern wet and dry bulb thermometer for determination of relative humidity. Consist of mercury filled German glass white back thermometers. Fitted on metal scale. Quality reinforced polypropylene plastic case with lid and bulb protector. Detachable plastic water cistern. Boxed with hygrometric tables, spare wicks and mounting screws. Size: 330 mm x 80 mm. Range : +20°C to 120°F (-5° to 50°C)
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