Features: Selectable pressure range: 2.999psi Accuracy: 0.3 percent FSO (at 25C) Repeatability: 0.2 percent (Max 0.5 percent FSO) Linearity or Hysteresis: 0.29 percent FSO. Dual Input that can test or measure the differential gas pressure with its provided twin input probes. 11 Selectable Units of Measure (kPa, Psi, Kgfcm2, Ozin2, Bar, mbar, mmHg, InH2O, FtH2O, Pa). Max or minimum record function Data save function,can store 100 groups of data. Ideal tools for measuring the air pressure of a single pipe, the differential pressure of two pipes, ventilation, air condition systems, gas pressure system, etc. Package Includes: 1x Manometer 1x Pouch 2x Pipes 1x Metal Part 1x Manual Specifications: Material: ABS Size: 164x70x32mm or 6.46x2.76x1.25in Battery: 1x9V (NOT included) Selectable pressure range: 2.999psi Accuracy: 0.3 percent FSO (at 25C) Repeatability: 0.2 percent (Max 0.5 percent FSO) Linearity or Hysteresis: 0.29 percent FSO Response Time: 0.5 Seconds Over Range Indicator: Err 0 Under Range Indicator: Err 1 note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.