Adopts quality pressure sensor, high accurate ADC, and low consumption MCU. Indoor temperature measurement digital manometer with wide range, high resolution, and high measuring accuracy. Multifunctional with temperature and pressure measurement, data storage, low battery reminder, data hold, max/min value mode, DIF mode, and more. 12 selectable pressure units: mmHg, inHg, ftH2O, cmH2O, inH2O, Pa, kPa, mbar, bar, psi, kg/cm, oz/in. Equipped with digital LCD display for clear reading. Real-time pressure measurement via single channel; pressure difference detection between two ports using dual channels. Suitable for HVAC systems, gas pressure measurement, calibration, and general pressure system diagnostics. Product Name: Digital Manometer Display: LCD Battery: 1 x 6F22 9V 250mAh (not included) Pressure Measurement Range: 2.999 psi Accuracy: 0.3% FSO (at 25C) Data Storage Capacity: 100 readings Max Pressure: 20 kPa Units: Switchable Low Battery Indicator: 6.8V Auto Power Off: 15 minutes after inactivity Operating Temperature: 050C (32122F) Storage Temperature: -10 to 60C (14140F) Product Dimensions: 159 x 76 x 32mm / 6.26 x 2.99 x 1.26in Carrying Bag Dimensions: 180 x 110 x 30mm / 7.09 x 4.33 x 1.18in Product Weight: 260g / 9.17oz Color: Black + Orange Material: ABS Package Contents: 1 x Digital Manometer 2 x Tubes 1 x Adapter 1 x User Guide 1 x Carrying Bag Note: Light reflection and screen differences may cause slight color variation between image and actual item. Measurement error allowance is +/- 1-3cm.