A sling psychrometer is used to determine relative humidity, dew point,
and vapor pressure. G-140 Sling Psychometer has tubes recessed in gray
metal back, folding swivel handle and boxed with spare wicks and instuctions.
G-142 Pocket Sling Psychrometer has self-contained sling-pocket case
and slide rule. Range 20 to 120F high impact plastic.
A sling psychrometer is used to determine relative humidity, dew point,
and vapor pressure. G-140 Sling Psychometer has tubes recessed in gray
metal back, folding swivel handle and boxed with spare wicks and instuctions. 
