This is a handheld TDS meter which can be used for estimating water quality. (Note: I don't think this is a failsafe method - but I still find it very useful / reassuring.)
It has two buttons (On/Off and Hold) - and looks almost identical to the one shown in the photo.
I am happy to share it out to people for a few days / on an as-needed basis.
- 5 years ago