This instrument can measure the air pressure of the single-pipe, or differential pressure of two pipes. Adopts quality pressure sensor, high accurate ADC and low power consumption MCU. Multifunctional, with temperature/pressure measurement and store function, low electricity remind function, data hold function, max/min value mode, DIF mode and etc.. It is suitable for measuring of ventilation and air condition system, and widely use for gas measurement, calibration, and other troubles of pressure system. Features: Adopts quality pressure sensor, high accurate ADC and low power consumption MCU. Professional indoor temperature measurement digital manometer, with wide-range, high resolving power and high measuring accuracy. Multifunctional, with temperature/pressure measurement and store function, low electricity remind function, data hold function, max/min value mode, DIF mode and etc.. celsius and Fahrenheit is switchable. There are 12 pressure units adjustable, you can adjust to mmHg, inHg, ftH?O, cmH?O, inH?O, Pa, KPa, mbar, bar, psi, Kgcm2 and ozin2. Equipped with large digital display, you can see the data clearly. Quickly measuring real time pressure value through single-channel, and detect the pressure differences of two detection ports through two channel. It is suitable for measuring of ventilation and air condition system, and widely use for gas measurement, calibration, and other troubles of pressure system. Specifications: Name: Digital Manometer Material: ABS Display: LCD Battery: 1 * 6F22 battery, 9V, 250mAh (included) Pressure measurement-range: +/-2.999psi Accuracy: +/-0.3%FSO (at 25 celsius ) Data storage quantity: 100 Max pressure: 20KPa Units: celsius / Fahrenheit switchable Lower battery remind: less than 6.8V Automatic close: 15min after no operation Working temperature: 0-50 celsius (32-132 Fahrenheit ) Storage temperature: -10 celsius to 60 celsius (14-140 Fahrenheit ) Item size: 159 * 76 * 32mm / 6.26 * 2.99 * 1.26in Carrying bag size: 180 * 110 * 30mm / 7.09 * 4.33 * 1.18in Item weight: 260g / 9.17ounce Package size: 205 * 145 * 40mm / 8.07 * 5.71 * 1.57in Package weight: 290g / 10.23ounce Packing List: 1 * Digital Manometer 2 * Tube 1 * Adapter 1 * Guideline 1 * Carrying Bag