Description: This instrument is used for measuring differential/positive /negative pressure with 11 selectable unit. When equipped with hose connection, it is suitable for measurement and field check of ventilation and air conditioning system, corrective maintenance for clean room or any gas pressure system. A indispensable testing tool for technician, operation maintenance engineers and researchers. Features: Large LCD digital display with backlight that makes reading more clear and visually in dark areas. It features 11 selectable units of measure: inH2O, psi, bar, mbar, kPa, inHg, mmHg, ozin2, ftH2O, cmH2O, kgcm2. Data hold function. Max/Min/Avg value with relative time stamp. Zero adjust, offset and DIF function. Comes with a portable pouch, which makes it easy to be taken anywhere or to be stored for next time use. Suitable for measurement and field check of ventilation and air conditioning system, corrective maintenance for clean room or any gas pressure system. Specification: Model SW-512 Measuring Unit Measuring Range Resolution kPa 13.79 0.01 mmHg 103.4 0.1 inHg 4.072 0.001 psi 2.000 0.001 mbar 137.8 0.1 bar 0.137 0.001 Ozin2 32.00 0.01 kgcm2 0.140 0.001 inH2O 55.40 0.01 ftH2O 4.612 0.001 cmH2O 140.6 0.1 Accuracy 0.3%FS Repeatability 0.25%FS Maximum Pressure 30KPa Pressure Connection 1 * 1/8" Quick joint Working Temperature 0-40 Storage Temperature -10-60 Over Range Indicator Err1 or Err2 Difference Measurement Yes Data Hold Yes Characteristics Material Plastic, Metal Color Black Yellow Power 1.5V 3 * AAA battery Product Size(appr.) 128 * 63.5 * 27mm / 5.0 * 2.5 * 1.1inch Package Weight(appr.) 362g Accessories Pouch, User Manual, Hose Package Included: 1 * Differential Manometer (Battery is not included) 1 * Hose 1 * Pouch 1 * User Manual