I use pH meters in my business and I agree with others here. They are a pita to keep them calibrated and they are expensive and don't last long. Made in china , so just get some pH paper strips, they will do what you need for ponds.
Tracy
What is your business if you don't mind me asking?
If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.
, so just get some pH paper strips, they will do what you need for ponds. 
