Floor slip resistance testers. Both testers have rubber pads that are either dragged (bottom machine) or swung (top tester) to measure floor slip.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...nce_tester.jpg
Previously:
https://www.homemadetools.net/forum/...193#post161222
https://www.homemadetools.net/forum/...839#post152464
https://www.homemadetools.net/forum/...514#post135876
https://www.homemadetools.net/forum/...062#post168485
https://www.homemadetools.net/forum/...897#post164078
https://www.homemadetools.net/forum/...479#post154878