Digital Manometer Differential Pressure Gauge {1psi}

I advertise this as second hand but its still new new in its box and still have plastics though

Note: Only the Digital Manometer is in the box only nothing more

This high quality Professional Digital Manometer that measures Gauge Pressure-a measure of pressure with reference to ambient pressure, and Differential Pressure- a measure of the difference between two pressures. This Manometer has a 11 pressure units that are selectable for Imperial and Metric in the different area:inHg,ftH2O,Ozin2,kPa,Kgcm2,mmHg,psi,inH2O,bar,mbar(hpa),mmh2O. This Manometer is ideal for HVAC/R technicians, gasfitters, plumbers, Medical equipment,Computer Peripherals,Pneumatic controls that require low pressure readings

• Portable Digital Gauge & Differential Pressure meter
• 11 measuring units: bar, oz in2, psi, kPa, inHg, mbar, mmHg, kgcm2, inH2O, ftH2O, mmH2O
• Highly accurate measurements; accuracy is at ±0.3% of full scale
• 4mm negative and positive metal hose plug
• Hold function freezes current readings
• Checking Min, Max, Record Features
• Over-range indication with error message
• Display pressure change from baseline
• Blue backlight function works for dark are
• Auto power off that can be disabled
• Accumulative time shows in recording period
•  

  Range PSI	± 1.00
  Resolution PSI	± 0.001
  Accuracy	±0.3% of full scale at 25°
  Linearity / Hysteresis	±0.29% ~ 1% of full scale
  Combined Accuracy	±1.0% of full scale
  Response Time	0.5 second
  Lug & Tubing	4mm lug and 2 x orange tube 500mm long (included in set)
  Compensated temp	range:10 ~ 30 °C
  LCD size	32.5 x 54mm
  Operating Temp	0  ~  50 °C
  OPerating RH	Humidity <80%
  Storage Temp	-20 ~ 50 °C
  Storage RH	Humidity <90%
  Repeatability	±0.2% ~ 0.5% of full scale
  Manometer Dimension	169 x 78.3 x 34.4
  Manometer Weight	200 grams
  Battery	6 x AAA batteries