Usage Tips:Features: Professional Manometer: it can test the differential pressure of areas and pipes, wind velocity of pipeline. It has +/-2Psi(kPa) pressure range and +/-0.3% accuracy. Clear Display: 2.4-inch LCD screen with backlight display for easy reading. 12 Selections of Measuring Unit: Pa, psi, kgfcm2, bar, inH2O, ftH2O, inHg, mmHg, ozin2, mbar, cmH2O, kPa. Other Features: Max./Min./Average value measurement function; calibration, data hold and zero function. User-friendly Prompt: low battery indication, Hi and Lo over range indicator. Low Power Consumption & Power Saving: powered by 3pcs AAA batteries(NOT included), and it will automatic power off after no operation for 10 minutes. Compact Size & Lightweight: easy to operate and carry, it also comes with a protective pouch. Wide Applications: applied on chemical industry, electrical industry, nuclear industry to measure the difference of air pressure, etc. Specifications: Material: ABS Pressure Range: ±2.000Psi Measuring Unit: Pa, psi, kgfcm2, bar, inH2O, ftH2O, inHg, mmHg, ozin2, mbar, cmH2O, kPa Accuracy: ±0.3% FSO (at 25) Repeatability: ±0.2% (max.±0.5%FSO) Linearity/Hysteresis: ±0.29% FSO Data Storage: 99 groups Respond Time: 0.5s Out of Range Indicator: Hi or Lo Auto-off: No operation for 10 minutes Operating Temperature: 0~50 / 32~122 Storage Temperature: -10~60 / 14~140 Power Supply: 3 * 1.5V AAA battery (NOT included) Item Size: 167 * 67 * 31mm / 6.57 * 2.64 * 1.22in Item Weight: 158g / 5.58oz Package Weight: 247g / 8.72oz Package Size: 20 * 12 * 5cm / 7.87 * 4.72 * 1.97in Packing List: 1 * Manometer 1 * Metal Connector 2 * Plastic Pipes 1 * Pouch 1 * Manual(English)