I needed to read very high Amperes. I purchased 'inductive' meters from an automotive supply house. (JC Whitney, a few dollars each, I don't know about availability at this time). It's really a magnetic needle, like a compass. You hold it against the wire. No direct connection. The needle moves right to indicate positive flow, left for negative flow. Just the thing if you need to read alternator current, or starter current draw in the hundreds of A.
Accuracy is questionable. So you would need to adjust distance of the magnetic needle, until it reads 10A when your DMM reads 10A. Then assume the magnetic needle gives correct readings for greater than 10A.
I found I could make it more sensitive, by holding a very strong neodymium magnet near the needle. Any semblance of calibration was lost, of course.