Yeah wanting to do the same - just relative measurements between motors and track magnet strength.

Yeah I am putting an order in. I have a left over arduino and was thinking the same but just running off the computer. Was a little concerned about the 0-5V measurement being to wide to get repeatable output readings at the 0-200mV range but it looks like you have it worked out. The panel meter solution is a little more pricey too but looking for a project to do with my kids so with he rest of the parts its still about $40. I have a 3d printer as well so always looking for something to make with it!

Roelof - for a panel meter the product you used isnt readily available here in the states. I was going to use this one (200mV range in 5 volt as it seems to work better to avoid current in the ground). Interested in your thoughts as although I play around with DC circuits and know some of the basics I am far from an expert on sensor monitoring.
https://www.mouser.com/datasheet/2/281/20lcd-41581.pdf