The sling psychrometer is used to determine
relative humidity, dew point and vapor pressure.
G-140 Sling Psychrometer has tubes recessed in gray metal back,
folding swivel handle and boxed with spare wicks and instructions.
G142 Pocket Sling Psychrometer has self-contained sling-pocket
case and slide rule. Range 20o to 120o F, high impact plastic.
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