Any ideas what this is from ???

Yeah well it was £14.99 of eBay pretty shit tbh it’s blue just say ph on it
Them are honestly the worst ph meters they don’t clarify you have to store them in a special solution are you storing it in the “special solution? Some people know when I first started I didn’t and was having some issues similar to yours narrowed it to ph and went and bought an aperea ph meter for 50 bucks comes with pre made solutions and a you can use the 4.0 solution as the storage solution so the probe doesn’t dry out which is a common problem cause they don’t explain it so had to toss the 10 one but the 50 one is much better that’s in USD btw
 
Top