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Amazon.com: Extech 445815-NIST Hygro-Thermometer and Humidity Alert with Dew Point and NIST : Appliances
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Extech RH390 Precision Thermohygrometer, 0 to 100% RH/, -22 to 199F: Amazon.com: Industrial & Scientific
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Extech - 14 to 140°F, 10 to 99% Humidity Range, Thermo-Hygrometer - 88634498 - MSC Industrial Supply
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