I have a decent pair of Tek scope probes which I am using on both my old T922 and the new Siglent. But recently I unearthed a pair of BK Precision PR-40 which I must have bought sometime in the late 80s at a hamfest. I haven't been able to find much info on them, and consequently have no real knowledge of how good they are. They have a 1x / 10x switch but no contact to switch the scope mode, so that has to be done manually. Are they worth keeping? I mostly do audio, and seldom venture into the MHz region, so I suspect they'd be fine - but again, no specs.