Robinair’s 14777 electronic vacuum gauge is compact in size at just 2-1/2" x 3" but accurate enough to clearly indicate when the system is free from moisture and ready for recharging. Specifically designed for use with a high vacuum pump and reads down to 10 microns. Clearly shows vacuum level and the easy-to-read LCD automatically registers smaller numeric segments as system pulls down. Features 6" Lead and magnetic mounting strip for service flexibility and hassle-free operation. Specifications range: 25,000 to 10 microns vacuum fitting, 1/4"MFL power supply, and one 9V cell battery is included.