Features: Selectable pressure range: ±2.999psi; Accuracy: ±0.3%FSO (at 25°C) ; Repeatability: ±0.2% (Max ±0.5%FSO); Linearity/Hysteresis: ±0.29%FSO. Dual Input that can test / 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 / minimum record function; Data save function,can store 100 groups of data. for 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. Specifications: Material: ABS Size: 164x70x32mm/6.46x2.76x1.25in Battery: 1x9V (NOT included) Selectable pressure range: ±2.999psi Accuracy: ±0.3%FSO (at 25°C) Repeatability: ±0.2% (Max ±0.5%FSO) Linearity/Hysteresis: ±0.29%FSO Response Time: 0.5 Seconds Over Range Indicator: Err 0 Under Range Indicator: Err 1 Package Includes: 1x Manometer 1x Pouch 2x Pipes 1x Metal Part 1x Manual 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.