Bacharach Sling Psychrometer

This uniquely compact Bacharach Sling Psychrometer accurately determines percent relative humidity without the necessity of consulting complex tables
Designed for portability (7.5"" long x 1"" diameter)
Slide rule construction quickly converts temperature to relative humidity
Built-in water reservoir holds sufficient water for several hours of testing
Thin bulb design gives fast thermal response
Thermometers constructed of shock-resistant glass; stems have deep-etched numerals and 1 deg. scale divisions for easy reading
Accurate to within 5% R.H.