Hi! This isn't necessarily a 'testing and balancing your water' issue, but I'm not sure where to go with this. I purchased the TFP-PRO less than 2 months ago and the other day I opened my kit to the attached picture. Has this happened to anyone else? It still works, but I don't feel comfortable using it. I've since removed one battery. I'm more curious as to why it burned like that. I'm careful to dry it off if it gets water on it during testing. Thoughts?