H-B DURAC Compact Sling Psychrometer 20/120F
MEASURE RELATIVE HUMIDITY WITH WEATHER BUREAU-TYPE WET AND DRY BULB THERMOMETERS. TWO ORGANIC LIQUID FILLED THERMOMETERS WITH WHITE BACK GLASS ARE MOUNTED IN A POCKET SIZED SELF-CONTAINED PLASTIC CASE DESIGNED WITH A BUILT IN SLIDE RULE TO CONVERT WET AND DRY BULB READINGS TO RELATIVE HUMIDITY THUS ELIMINATING THE NEED FOR CALCULATING TABLES.
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