Manufacturer of ESD Static Control Products
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Depending upon your Tester, it can be adjusted to ensure that it does not pass personnel grounding above 3.5 x 10E7 ohms which is the upper limit per Table 2 of ANSI/ESD S20.20-2007 for Wrist Strap System and Flooring-Footwear System.
For example, see our SmartLog X3 and its Technical Bulletin on our website. On page 3 of our Technical Bulletin there is a noted tolerance of the 3.5 x 10E7 ohm setting is +/- 10%. This does allow a pass for a operator as high as 3.85 x 10E7 ohms. This has been industry practice for decades.