The LCD Digital Manometer Differential Dual Port Air Pressure Meter by AUTOOL is a high-precision tool for HVAC gas testing. With an accuracy of ±0.3% FSO and repeatability of ±0.2%, this meter provides reliable measurements for pressure range of ±20.68Kpa/±2.999PSi. It features a compact size of 164*70*32cm and weighs 200g, making it convenient for use. The meter also includes optional indoor temperature measurement in ℃/℉ units, automatic shut-down after 15 minutes, and data storage for up to 100 groups. With a warranty of 3 years, this manometer is a durable and efficient tool for professional use.