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.
This sofa is intact but needs a professional to give it a good clean. I'm adding it here as a gift, otherwise someone will come totals it away. Maybe you or someone you know can make it brand new. Needs someone with a can to collect and lift from the house.