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Features: 1.11 selectable units of Measurement 2. Differential pressure measurement 3. Max / minimum / Average reading record function 4. Data hold function 5. Large LCD with backlight 6. Zeroing, offset, and data compensation 7. Low battery alarm 8. Auto power off setup function 9. Over range indicator Specifications: 1. Pressure Range: +/-2psi 2. Accuracy: +/-0.3% FSO (at 25°C) 3. Repeatability: +/-0.2% (Max+/-0.5%FSO) 4. Linearity/Hysteresis: +/-0.29% FSO 5. Response Time: 0.5sec 6. Over Range Indicator: Hi 7. Under Range Indicator: Lo 8. Operating Conditions: 0 to 50°C(32 to 122°F) 9. Storage Conditions: -10 to 60°C (14 to 140°F) 10. Power supply: 9V battery 11. Dimension: 6.5 x 3.1 x 1.8 inch/ 165 X 80 X 45mm 12. Weight:220g (battery is not excluded) Package included: 1 x Manometer 1 x English User Manual 1 x Protective bag 1 x Metal connector 2 x 7.5inch / 19CM rubber tube