'standard' atmospheric pressure is 760 Torr, the lower the Torr, the stronger the vacuum. 'total' vacuum would in theoretically be 0 Torr, a strong vacuum (I think) is below 100 Torr?700 Torr is a weak vacuum.
I'm in Australia & could only suggest possible suppliers down under (& they would be importing from China or USA?)
Let us know how your experiment goes.
Peter
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