The XIKAR Round Digital Gauge Hygrometer, designed for easy installation in standard humidors, measures 2.28″ W x 0.66″ D and tapers to 1.81″ W on the backside. It features a refresh rate of 15 seconds and operates with a CR2025 button cell battery. The XIKAR PuroTemp Gauge Hygrometer has been meticulously redesigned to provide accurate humidity readings straight from the box, eliminating the need for calibration. This advanced hygrometer offers precise monitoring of your humidor’s environment, ensuring optimal conditions for your cigars.