TDS meter is making strange noise and isn't working, broken?

[slippy]

Just get a new one? It just making a squeaking noise and doesn't stop. Should they be kept in a dry place? Mine has a hole in the top(opposite the bit which is put into the water), could some water have got in and broke electronic components inside?

 

[Solarpanelcleanington]

I left one out in the rain once. Knackered it.