The Ashcroft/Heise AM2-RT2 is the most accurate and reliable digital pressure gauge on the market. With its patented Resonant Technology, the AM2-RT2 provides unmatched accuracy of ±0.025% of reading, even in harsh environments. The AM2-RT2 is also the most durable digital pressure gauge on the market, with a rugged construction that can withstand drops, shocks, and vibrations.