1. Using DL423-91 vacuum pressure difference method standard, testing sensibility <0.2%

2. Full metal structure to replace glass tube type which is fragile and difficult to seal.

3. Automatic quantitative sampling, measuring, displaying, saving of data, and oil discharge

4. High sensibility, good repeatability because of using high precision high stability sensor

5. Auto measure present atmosphere pressure and ambient temperature, whenever and wherever, auto calculate and display air content under 101．3Kpa、0℃

6. Unique testing program for gas injection calibration and re-calibration

7.Push start key then after about 7 minutes the testing results can be displayed on the screen. It automatically save 20 testing results which can be reviewed at any time

8. Whole process control on vacuum pump running, low noise

9. Simple to operate, only need connection with one channel gas supply and vacuum pump