The  specification of Differential pressure gauge :

2000 series differential pressure gauge minimum range 0-30Pa, maximum range 0-30KPa. There are as many as 88 kinds of range and metric / imperial units to choose from. 
    This differential pressure gauge using frictionless magnetic components, can rapidly measure the micro-pressure air or non-corrosive gases, including positive, negative (vacuum) or differential. No wear, hysteresis and clearance. Not filling, vaporization and freezing. This design has anti-vibration, anti-shake and high overpressure capability, you can guarantee access to high precision. The design impact, shock and overload protection.

Technical data of Differential pressure gauge  :

1 Medium: air and non-combustible, compatible gases (optional gas) 
2 Housing: cast aluminum housing or ABS shell, glass beveled panels. Dark gray coating, can withstand 168 hours salt spray test 
3 Accuracy: 2% FS (mm units, and the range with the corresponding pa) 
4 Pressure range:. -20Hg To 15 psig (-0.677 bar to 1.034 bar) 
5 Temperature range: 20 to 140 ° F (-6.67 to 60 ° C) 
6 Hole size: 114mm 
7 Mounting Orientation: Diaphragm in vertical 
8 Connections: same 1/8 "NPT high and low pressure fittings, one pair on the side, one pair in the back 
9 Weight: 500g / only 
10  Standard accessories: two 1/8 "NPT threaded connectors for high and low pressure fittings can be connected with a rubber tube; two 1/8" NPT plug for blocking the remaining two high and low pressure ports; three a threaded countersunk mounting coupling (mounting ring, according to buckle holder for three interfaces to replace MP and count on attachments HP)