I've found a few weak points with my mechanical edge finder, so I bought an electronic edge finder to compare. In this video we look at some the disadvantages with the mechanical type and see if the electronic type is better.

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Electronic edge finder;
https://www.cutwel.co.uk/20mm-x-10mm-...

Mechanical edge finder;
https://www.cutwel.co.uk/measuring-an...

Timestamps
0:00 Introduction
0:16 How does an edge finder work?
1:54 Electronic edge finder
2:44 Problem 1 - rubbing
3:11 Problem 2 - repeatability
4:35 Problem 3 - burrs
5:10 Summary
5:25 Other things to consider
5:48 Cost
6:40 Conclusion