Barometer Digital Manometer Air Pressure Gauge Handheld Digital Differential Natural Gas Pressure Meter 12 Measurement Units Fe ature This instrument can measure the air pressure of the single pipe,or differential pressure of two pipes.it is suitable for measuring of ventilation and airconditionsystems, and widely use for gas measurement, calibration, and any trouble shooting of any gas pressure systems. This instrument can measure differential pressure/positive pressure/negative pressure, and is equipped with a simple hose link device. No operation for 15 minutes, automatic shutdown. This digital manometer has Dual Input that can test / measure the differential gas pressure with its provided twin input probes.Max / minimum record function; Data save function, also has room temperature future. 12 Selectable Units of Measure InH2O, Psi, Mbar, kPa, inHg, mmHg, ozin2, FtH2O, cmH2O, KGCM2, Bar,Pa. The gradient operation and reading are clear, and it is a good helper for HVAC technicians, operation and maintenance engineers and scientific researchers. Specification 1.Selectable Pressure Range:2.999 psi 2.Accuracy:0.3% FSO (at 25) 3.Repeatability:0.2% (Max0.5%FSO) 4.Linearity/Hysteresis:0.29% FSO 5.Response Time:0.5Seconds 6.Over Range Indicator: Err 0 7.Under Range Indicator: Err I 8.Temperature:-40 to 80(-40 to 176) 9.Operating Conditions:0 to 50(32 to 122) 10.Storage Conditions:-10 to 60 (14 to 140) 11.Battery:9V battery(not included) 12.Dimension:164x70x32mm 13.Weight:200g Packing List: 1hose 1handbag 1Pressure head 1Host 1English manual _x000D_