the sunleaves pen is a bit more in price but will read over 2000ppm's. It shows a X when you get over a 1000ppm's. Like 120 times 10= 1200. milwaukee ph pen is great to keep ph spot on , just remember to get calibration and or the storeage solution especially. To store the pen electrod in for longer life of pen. Some times you have to calibrate them both or check at least to make sure your right on.
LOC NAR1958 Reviewed by LOC NAR1958 on . pH/TDS meter Been growing in dirt for a while, using chem indicators for pH and TDS. Worked well. Grew last batch in a drip/bubbler hybrid frighteningly similar to one of the systems I saw on the board recently. Anyway, using the chem indicators is a bear but the hydro results were superior even on my first try. What brand are you guys/gals using? Combined meter, or separate? Any models that you can simply leave in the resevoir, or are they too delicate? Thanks Rating: 5