Description: ht-1890 Portable LCD Digital Pressure Gauge Differential Pressure Gauge Gauge Pressure Gauge -13.79 kPa 13.79 kPa This digital pressure gauge is a professional instrument for measuring and differential pressure in the ranges of ± 13.79 kPa. ± 2 psi/Â ± 55.4 H2O Gauge pressure is the values zero-referenced against air pressure while the differential pressure is the difference between two points. It has dual input ports for measuring differential pressure. There are many different scales & 11 units for pressure and this model features the most common scales even in H2O, psi, bar, mbar, kPa, inHg, mmHg, ozin2, ftH2O, cmH2O kgcm2. Thanks to Rec mode, you can see the highest (max), lowest (min) and average (AVG) reading comfortably with a relative time stamp. It also has LCD backlight for use in dark areas and power off function for long-term monitoring. The pressure gauge is ideal for use in HVAC industry, pneumatic control, medical equipment, gas appliance repair and installation, laboratory tested) computer peripherals. Features: pressure gauge and differential pressure. Measuring ranges ± 13.79 kPa/Â ± 2 psi/Â ± 55.4 H2O. 11 selectable scales & units: in H2O, psi, bar, mbar, kPa, inHg, mmHg, ozin2, ftH2O, cmH2O kgcm2. High accuracy ± 0.3% in full scale. Large LCD display with backlight. Set zero, offset functions. MAX/MIN/AVG values with a relative time stamp. Data Hold Keep error codes out of range. Low battery indicator. Auto power off (can be switched off). 4 pairs of hoses included. Display: dual LCD accuracy: ±0.3% FSO (25°C) repeat accuracy: ±0.2% (max ±0.5% FSO) linearity/hysteresis: ±0.29% FSO Maximum pressure: 10psi response time. : 0.5 Seconds typical low battery level: yes over range display: error 1 below the table range display: error 2 operating conditions: 0 to 55 °C (32 to 122 °F)