Brigham Enterprises Hygrometer Digital Round

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Fits the majority of round humidifier mounts! To within two degrees, this instrument measures temperature and relative humidity. Batteries and instructions are supplied. 
Dimensions: 1.85 "/47mm. 0.70 inches tall "/17mm. 
Brigham's Round Digital Hygrometer will precisely measure the temperature and relative humidity (RH) in your humidor to within +/- 1-degree C/F and +/- 2 degrees at 70 percent, respectively.