Fluke sells a magnetic strap hanger as mentioned (pretty damn strong magnet) and when not in use it rests against the back side of the meter, so no, at least as far as Fluke is concerned, not a problem. However, I keep my fluke 87 with the magnet magnet hanger accessory in the same tool bag with my Fluke 337 AC/DC clamp meter. I *assume* that since it measures DC, the 337 employs a hall sensor, and I further *assume* that this hall sensor would not appreciate the clamp being magnetized by an external permanent magnet, so I take extra care to keep the 87's magnet away from the 337 and away from my digital caliper. I might just be paranoid; the 337's clamp is probably ferrite or something else that can't be magnetized, but better safe than sorry.