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All Humidity Is Relative
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All Humidity Is Relative

Is that a rubber chicken you're swinging above your head? No, it's a sling psychrometer from Sper Scientific! You're not exorcising that science class, you're teaching them basic concepts and elemental weather measurement! You've filled the small reservoir that wets the wick attached to one of the two thermometers in the plastic 9" x 2" x 5/8" device. You've spun it above your head by its fold-out handle like a New Year's Eve noisemaker. You've calculated the difference in temperature between the two thermometers and consulted the enclosed chart to determine the relative humidity. Three times. Now you can tuck it back in its slim canvas shoulder pouch, acknowledge their wide-eyed admiration, and start telling them about burying that string under the light of a full moon....

92465 SLING PSYCHROMETER
$69.95 EACH
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