Introduction:
The device measures Gauge/Differential Pressure from -55H2O to +55H2O(+2 psi).It features 11 selectable 
units of measure: in H2O,psi,bar,mbar,Kpa,InHg,mmHg,ozin2,FtH2O,cmH2O,kgcm,Additional features 
include Data Hold and Auto Power off disabled.Careful use of this meter will provide years of reliable service

Specification:

Display:                         Dual LCD
Accuracy:                      +/-0.3%FSO(25C degree)
Repeatability:                 +/-0.2%(Max+/-0.5%FSO)
Linearity/Hysteresis:       +/-0.29%FSO
Maximum Pressure:        10psi
Response Time:               0.5seconds typical
Low Battery Indicator:      Yes
Over Range  Indicator:      Err.1
Under Range Indicator:     Err.2
Operating conditions:       30...122F degree(0-50C degree)
Storage Conditions:          14...140F degree(-1...60C degree)
Power Supply:                 1*9V Battery or External 9VDC
Standard Accessories:      Pouch&.Tubing