When I went to your site, there are about 15 ppm readers on one page. Which ever you choose, be sure to purchase ppm and ph meter calabration solution. They make it for both your meters and it's an important solution that calibrates the solution before your reading. It's not complicated to use. The instructions are very user friendly on the calibration solution as well.

I wish you Good growing!
hippieshaven Reviewed by hippieshaven on . Plants Looking Ill All but one plant is looking ill....I am using flora-series Nutes, and looks like burning leaves from nutes...Since it startesd i have changed reserv...and went with half the nutes to water ratio.. have a 6.0 ph and still looking like it is burning leaves I even backed off timer to go on 15 min off 45... thinking i was overfeeding? any suggetions? I do have one plant that i just took from soil and put in system 3 days ago that looks great.... Rating: 5