Features: 1. Large dual LCD with backlight 2. Data hold 3. Max. / Min. / Average value with relative time 4. Low battery indicator, automatically power off 5. Data record 6. Error code 11 selectable units 7.Resolution: 1 inH2O Accuracy: +/-0.3% FSO (25 degrees C) Repeatability: +/-0.2% (MAX +/-0.5%FSO) Linearity / Hysteresis: +/-0.29FSO Low range indicator: Err.1 Over range indicator: Err.2 Working temperature: 0 to 50 degrees C Response time: 0.5 sec Battery: 1 x 9V (not included) Range: -55H2O to +55H2O Packet: 1 x Digital Manometer 1 x Leather Case 2 x Tube 1 x Metal accessory 1 x English user manual