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/20mmx10mm...

Mechanical edge finder;
https://www.cutwel.co.uk/measuringan...

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