I have tried everything over the years, wigglers LED's, lasers, playboy [ but we won't go there ] and I have always gone back to the wiggler / edgefinder.

I recently bought a pair of the ones Bogs linked to from ARC and these are my tool of choice only because I work in metric and my old bent up wiggler is still in imperial.

I bought one of the audible and light up ones, cost me about 50 quid so for that money it has to be the best thing since sliced bread ?
Nope, because of the brightly lit workshop and running machinery on the first edge I didn't see the light or hear the beep so that was 50 quid thrown into the bent bits scrap bin.

Oh well another flat battery in the car park of life.