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Stable and Reliable Sensor: Use temperature-compensated pressure sensor, temperature drift not exceeding ±0.04%FS/℃ Various Refrigerants Options: Built-in 87 types of normal refrigerants PT comparison table for your convenience such as R32, R410a, R134a and etc. LCD Screen& Blue Backlight Display: Partition display for different measurements, direct readings for all measurements. Zero Function: If deviation occurs at zero point, use ZERO button to zero out and correct the system. Two Overload Indication: Screen display of "Alarm" or "ALARM" & flashing backlight when overload is too high for certain levels.