The Additel ADT927 is the most accurate and versatile handheld pressure calibrator on the market. With its patented dual-sensor technology, the ADT927 can measure and source pressure with an accuracy of up to 0.025% of reading. It also features a wide pressure range of -14.5 to 3000 psi, making it ideal for a variety of applications. The ADT927 is also the only handheld pressure calibrator that can measure and source both positive and negative pressure. This makes it the perfect tool for calibrating pressure gauges, transducers, and other pressure-related devices.