Hello Joe and welcome to the forum.

First question, how can a tester be hands free and measure both shoes. If you look at the simple drawing,

the tester or meter is measuring the total series resistance of both shoes through the person. For example, if the limit on shoes is 5x10*7 ohms and each shoe with the person between the right and left show measures 1x10*7, then the total resistance will be 2x10*7 ohms and meet the limit set. If the resistance of one show is 1x10*7 and the other shoe is 3x10*8 then the total resistance would be 3.1x10*8 ohms and fail. What you would not know is which shoe failed.

As far as the second part, will this be the same as using a handheld probe and surface resistance meter, if you are standing on a metal plate and the resistance meter is connect in a similar manner, the results may be similar. Usually an integrated tester will only yield a pass or fail while the surface meter may give a results.

Using a 5 lb electrode may yield a different result. Using the electrode instead of a person may not have enough weight and the sweat layer of the person will not be present. To measure a shoe by itself, ANSI/ESD STM 9.1 uses an electrode of 25 lbs to make the measurement.

If you have any other questions, please feel free to add to the forum.