Manometer, Professional Air Pressure Meter Dual-Port HVAC Digital Manometer | Gas Pressure Tester Differential Gauge ±2.999 psi Range, ±0.3% FSO Accuracy, 12 Units, Backlit LCD, for HVAC Techs and DIY

Digital Manometer can the air pressure of the single pipe or differential pressure of two pipes measure handheld manometers temperature and pressure，it is suitable for measuring of ventilation and air condition systems, gas pressure system troubleshooting, laboratory testing, maintenance and installation of blowers, clean rooms, boilers and other gas appliances

High Quality & Large LCD Backlight Display And Prevent Eyes weariness The Handheld HVAC Manometer is made of ABS material, and the excellent performance of high-temperature resistance and impact resistance makes the air pressure meter have a long service life. 4.45CM×4.95CM display, support LCD backlight, convenient lighting operation, display data clearer and easier to read.

Short-press C/F to save the current measurement, then press and hold C/F to leave storage mode. During history review, short-press DIF to move forward or MAX to move back through saved readings, one record at a time. Press and hold UNITS for more than 2 seconds to clear all stored records. Data Hold freezes the screen, while storage saves a record for later review on the device. It is not designed for timestamped logging or data export.

This QX-1201 digital air pressure gauge measures ±20.68 kPa (±2.999 psi), with 0.001 kPa and 0.001 psi display resolution. Accuracy is ±0.3% FSO at 25°C; repeatability is ±0.2%, with a maximum of ±0.5% FSO; linearity/hysteresis is ±0.29% FSO at 25°C. The manual specifies a 0.5-second measurement interval. Select from 12 pressure units including kPa, psi, inH2O, mbar, and bar. Err0 indicates pressure above the positive range; Err1 indicates pressure below the negative range. FSO refers to full-scale output, not a percentage of each reading

The two hose-barb ports are specified for tubing with a 1/8-inch inside diameter, and one adapter is included with this product configuration. Standard HVAC test ports are often 5/16-inch NPT or 1/4-inch NPT, so a 5/16-inch NPT to 1/8-inch barb adapter may be needed — check your test-port thread before ordering. Seat each hose fully on its barb and check for leaks, kinks, or loose connections that could affect the measurement. Use the appropriate static pressure probe when required by your test procedure