This may be seen by some as a bit gadgety but I thought I'd share it as I've found it to be a great bit of kit.
I have always used a Trend gauge for setting the depth of cut and fence gap on my router table. Unfortunately said gauge met with an accident and so I was in the market for a replacement and ended up buying one of these from Peter Sefton's emporium.
What don't I like about it ...1) the name - gauge includes a u ... 2) made in China - I naively thought it was going to be made in the US.
Those points apart I really like it.
I regularly make inlaid jewellery boxes and having a digital read out means it's easier to be accurate. Age has dictated I am borderline for reading glasses so anything that avoids putting them on gets my vote.
The anvil is spring loaded and can be sat on the router bit while I adjust it to get exactly the depth I want.
The magnets in the handle keep it in place leaving both hands free.
It's bang on in terms of accuracy (which is something I understand I-Gaging have a reputation for) and while it may not be everyone's cup of tea it works for me.