Digital Pressure Gauge for Refrigerants
With Back light 0-500 PSI 1/8 NPT, Compatible with Manifold Gauge
Stable and Reliable Sensor: Use temperature-compensated pressure sensor, temperature drift not exceeding ±0.04%FS/℃"
Operating tempLCD Screen& Blue Back light Display: 
Partition display for different measurements, 
direct readings for all measurements .and humidity:10°C ~60°C; 35% ~ 85%RH
Various Refrigerants Options: Built-in 87 types of normal refrigerants 
PT comparison table for your convenience" 
Compatible with Manifold Gauge
Zero Function: If deviation occurs at zero point, use ZERO button to zero out and correct the system.
Two overload warning indications: The screen displays ALARM or if the overload is too high, the ALARM & back light will flash simultaneously.