1With 11 selections of measuring unit: kPa, psi, kgfcm, ozin, bar, mbar, inHg, mmHg, inHO, ftHO, cmHO. 2Complete functions, differential pressure measurement is very suitable for measuring ventilation and air conditioning systems. 3With the maximum, minimum, average pressure value recording and viewing function and data hold function. 4Large backlight display screen, overrange prompt, calibration function, is a good helper for measuring pressure. 5Compact size and light weight, easy to operate and carry. High quality ABS material, wear-resistant, anti-aging, durable. Item Type: Digital Manometer Material: ABS Color: As shown in the picture Size: Approx. 150x55x40mm / 5.91x2.17x1.57in Weight: Approx.200g/7.1oz Range: +5psi Accuracy: 0.3%FS Linearity/Hysteresis: 0.1% FS of full scale Pressure Range: 2Psi Repeatability: 0.25%FS Response Time: 0.5 seconds Pressure Connection: Two 1/8in (3.18mm) quick connectors Working Temperature: 0~50C (32~122F) Storage Temperature Range: -10~60C (14~140F) Battery Type: 9V battery (not included) Operation Method: First open the back cover, install the battery, press and hold the power button for 2 seconds to start up, the screen displays the parameters, adjust the measurement range, you can use it. Function: 1.11 air pressure units 2. Differential pressure measurement 3. Maximum, minimum, average pressure value recording and viewing function 4. Data retention function 5. Large backlit display 6. Low battery reminder function 7. Optional automatic shutdown function 8. Over-range prompt function 9. Calibration function Pressure functional unit Range Resolution Kpa 34.47 0.01 Psi 5 0.001 kgfcm 0.351 0.001 ozin 80 0.1 Bar 0.344 0.001 Mbar 344.7 0.1 inHg 10.18 0.01 mmHg 258.5 0.1 inHO 138.3 0.1 ftHO 11.53 0.01 cmHO 351.5 0.11 x Digital Manometer(Battery Not Included) 1 x Bag 2 x Hose 1 x Metal Connector 1 x Instruction Manual 1. Please allow 1& 8209;2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.