AZ 8215 15 psi Digital Manometer features:* Portable digital gauge/differential pressure meter* Over-range indication with error messages* Hold function, Maximum / Minimum, Record indicator* PC interface available for real time download* 11 units for selection (metric, imperial)* 2 size metal lug available: 4 mm (orange), 4 mm (white), & 8 mm (Black)* Plastic & metal available -4 mm, metal only -8 mm, metal or plastic* Accumulative time shows in recording periodSpecification of 8215 AZ 15 psi Digital Manometer:Model8215psi Range (Resolution):±15.00 (0.01)kPa Range (Resolution):±103.4 (0.1)mmHg Range (Resolution):±775.7 (0.5)Kg/cm2 Range (Resolution):±1.055 (0.001)mbar (hpa) Range (Resolution):±1034 (1)bar Range (Resolution):±1.034 (0.001)inH2O Range (Resolution):±415.2 (0.3)cmH2O Range (Resolution):±1051 (1)inHg Range (Resolution):±30.54 (0.02)ftH2O Range (Resolution):±34.60 (0.02)oz/inch2 Range (Resolution):±240.0 (0.2)Accuracy (25℃, 77℉):±0.3% of full scaleRepeatability:±0.2~0.5% of full scaleLinearity/Hysteresis:±0.29~1% of full scaleCombined Accuracy:±1.0% of full scaleResponse Time:0.5 secondCompensated Temperature Range:0~50℃LCD Size:51(L) * 29(W) mmOperating Temperature:0~50℃Operating RH%:Humidity ＜80%Storage Temperature:-20~50℃Storage RH%:Humidity ＜90%Meter Size:182(L) * 72(W) * 30(H) mmWeight~:150gBattery:9V battery or adaptorStandard Package:Meter,Manual,Connection Hose, Hard Carry Case