Casella Instruments Humidity Slide Rule Hygrograph Charts When connected to the Merlin

When connected to the Merlin wind indicator

requires no maintenance apart from routine cleaning

Rotating once every 29

5- or 10-minute) wind speed conditions

Plastic rainfall measuring jar for any 5" diameter rain gauge

Casella Instruments Humidity Slide Rule Hygrograph Charts When connected to the MerlinDescription Features Specification Simple humidity conversion table via a slide rule. Ideal for use with either a whirling hygrometer or instrument screen with masons hygrometer. After taking your dry bulb temperature, simply set the rule, and, at the wet bulb temperature, read off the percentage relative humidity figure. Suitable for use with whirling or masons hygrometer Measurements in C or F Temperature Range 15C to +60C