Incidentally, a cheap DIY method of ensuring that your meter probes are that sharp is to use needles. Depending on the brand, you may need to snip away some plastic; but the sampling lancets used for diabetes care are crazy sharp and comparatively inexpensive in boxes of 100 or so. A touch of soldering to connect the needle to the wire, and you’ve got something that will bite right through oxide, conformal coating, etc. and plenty of backups for when the first becomes dull or snaps.
