Masons Pattern Hygrometer Wet and Dry Bulb | P250X

Masons Pattern Hygrometer –  Overview Housed in a yellow plastic case with lid and bulb protection. Only available in Red Spirit. Supplied with Hygrometric tables, spare wick and instructions. Sold as single units. Masons Pattern Hygrometer – Features Requires no electricity no flat batteries no Atex issues. Reading of  Wet and Dry bulb Temperature Use Hygrometric table to get Relative Humidity