I once dropped a Fluke 77 in a bucket of salt water.
A friend had suggested that you could calculate the % of salinity of the water by measuring the resistance between two identically sized pieces of Copper clad board (PCB), then using a suitable correction factor.
I was interested in this because I had a saltwater chlorinator in my pool.
Anyway, I fumbled it, & dropped the meter in the bucket of water.
I removed it immediately, cleaned the outside, then opened it up----strangely, very little water had got in.
A quick wash with distilled water, followed by methylated spirits, then left it in the Sun for several hours.
The only thing that failed was the continuity beeper.
It was a work meter, gave no other problems.
After some time, it was due to go to Philips for a routine fixed price checkup & calibration check.
It came back fitted with a new beeper.