The Ashcroft/Heise AM22 is the most accurate and reliable digital pressure gauge on the market. With its patented DigiCell® sensor technology, the AM22 provides unmatched accuracy of ±0.025% of span and long-term stability of ±0.01% of span per year. The AM22 also features a large, easy-to-read display, a rugged construction, and a variety of mounting options.