XIKAR® Round Digital Gauge Hygrometer tapers to 1.81" W on backside for standard humidor installation measures 2.28" W x 0.66" D refresh rate: 15 seconds button cell battery : CR2025 XIKAR PuroTemp™ Gauge Hygrometer XIKAR PuroTemp™ Hygrometers have been redesigned to ensure accuracy right out of the box, without having to calibrate. You now have more time to spend enjoying...