Complete junk, bought a vacuum pump because of the 1/4 and 3/8 flare connections. The device arrived with a 1/4 Flare and 1/2 ACME ports. When they contacted the seller they returned $10. Used block and could not generate vacuum below 750 microns. Tested at home in a week, doesn't even measure the vacuum on the Omni Vacuum Gauge.
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