What is the lowest pressure in Torr currently achieved in laboratory and which gauge accurately measure it?

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Curtis Guild

Ion gauges (cold cathode, hot cathode) can get down to 10E-10 and 10E-11 torr. Take a look at UHV (Ultra-high Vacuum) manufacturers literatures, e.g. Perkin Elmer, Anton Parr, etc.

Ahmed Mortuza Saleque

McLeod gauge can measure vacuums as high as 10−6 torr

Shailaj Kumar Shrivastava

@ Thanks,but my concern is for~10E-17 torr and less than ~100 particles per cm^3.