Ok There is a PH meter that is on ebay for 29.99$ one of them stick in water testers. If you look it up you will see it, it is yellow. After you look at it let me know if they are good enough. I am sort of color blind when it comes to certain colors. I have trouble distiquishing between the light orange and yellow looks the same to me. If anyone has any place if the ones on ebay are no good where to get ph meters for a fairly descent price please let me know thanks.