Testo 552i vs Fieldpiece SVG3 micron gauges

Alright, I've been questioning my vacuum pumps and my vacuum and my setup. You see that getting close to 600 microns there? Now look what the 552i, the testo probe is reading. 1750. That's a big difference. I don't know if I got some oil on the sensor or something. but on 1700 and 630 two vastly different numbers right at 20 minutes i'm pretty stable at 550 microns the testo says i still haven't broke a thousand which one would you believe i'm gonna take that testo home and do that testing