Features： 1、Accurate and Versatile: The digital manometer offers a choice of pressure ranges, including ±2.999 psi, +7.57 psi, and +12.99 psi, with an accuracy of +0.3% FSO. 2、12 Selectable Units: This pressure gauge features 12 selectable units, including mmHg, inHg, ftH2O, and more, provides flexibility and convenience. 3、High Precision: Equipped with a sensitive pressure sensor, high precision ADC and low power consumption MCU technology to enhance accuracy. 4、Dual Port Design: The dual port design enables simultaneous measurement of differential pressure, allowing for more comprehensive and accurate readings. 5、Parameters: With high precision of ±0.3% FSO (at 25°C), repeatability of ±0.2% (Maximum +0.5% FSO), linearity hysteresis of ±0.29% FSO, response time of 0.5 seconds. Specification： Item Type: Digital Manometer Differential Gauge Selectable Pressure Range: ±2.999 psi, +7.57psi, +12.99psi Precision: ±0.3% FSO (at 25°C) Repeatability: ±0.2% (Maximum +0.5% FSO) Linearity Hysteresis: ±0.29% FSO Response Time: 0.5 seconds Over Range Indicator: Err 0 Below Range Indicator: Err 1 Temperature: -40 to 80°C (-40 to 176°F) Operating Conditions: 0 to 50°C (32 to 122°F) Storage Conditions: -10 to 60°C (14 to 140°F) Battery: 1x 6F22 9V battery (not included) Package List： 1 x Digital Manometer 2 x Silicone Tube 1 x Adapter 1 x Special Plug 1 x User Manual 1 x Storage Bag