An instrument for determining atmospheric humidity by the reading of two thermometers, the bulb of one being kept moist and ventilated.
Operates on AAA batteries, reading range -4 to +120 degrees F, accurate to with plus or minus 1 degree F.
Humidity range 0% to 100%, accurate to within plus or minus 3 % at 25 degrees C. Memory feature displays maximum and minimum temperature and humidity points reached when monitor was on. Temperature read out in C and F scales.
Model #990 DW - displays both wet and dry bulb temperature, humidity and dew point.
Model #EP 8706 - has the same characteristics as the #990 DW with the additional feature that it can be recalibrated.