BOVEDA BUTLER, THE TOTAL HUMIDITY MANAGEMENT SYSTEMWHY THE BOVEDA BUTLER IS THE MOST PRECISE HUMIDORMONITORFOR CIGAR HUMIDITYONE WORD: CALIBRATION. The Boveda Butler is the only humidor monitor equipped with the Boveda One-Step Calibration Kit. The only way to ensure your humidor readings are truly accurate is with a well-calibrated Boveda Butler.Chemists and lab professionals determine the accuracy of a hygrometer with a “salt test.” The Boveda One-Step Calibration Kit is the ultimate salt test.In just 24 hours, you can perfectly calibrate your Boveda Butler’s digital hygrometer.HOW DOES THE BOVEDA BUTLER WORK?It resides in your humidor—right on top of your cigars or affixed to your humidor’s lid. The Boveda Butler communicates via Bluetooth® to the free Boveda app on your iOS 10.0+ or Android 5.0+ mobile device. You can now access your humidor’s conditions all the time.