Maybe technology has reached a new point or a gadget appears that solves an issue in an old thread that could not be resolved at that point in time. Does not apply here though.
I used one when setting up my new (1 year ago) band saw. I put it on a fully tensioned blade and squared the tables miter slot to the blade. Worked great. I may have been lucky but the fence did not need any adjustment and I get accurate resaws deepest to date around 200mm.
Being a newbie to woodwork and having just bought my first bandsaw and about to set it up thought this might be a useful accessory, but then realized surely I can just use my mini magnetic spirit level and achieve the same thing?
I was tempted by this, I was just going to chuck it in the basket when I come to ordering other bits. Im a newbie and rarely use my bandsaw, it needs a proper setup
You can make your own.
A mall high strength magnet, that does not touch the kerf of the blade, and a 150mm steel rule (one that springs back to flat if it is flexed).