ph pen anyone have them

[fishguyxd]

anyone have and like them ,where do you buy them other than ebay?

[geopod]

Al I have one I bought it at a swimming pool store. a few years back

I like it and use it all the time it is quick and accurate.I take mine in for calibrations once a year.

george

[fishguyxd]

Do you recall about what there worth?