Digital pH Meter Pen Type Water Tester For Hydroponic Aquarium Spa Pool

This is the correct one to buy. EZ calculate. Backlit reading helps. These are worth the few bucks extra. Used my last one for four years...probably still good, just felt comfortable buying a new one

Do not buy this product. I bought 2 of these and neither will calibrate to a 7.0 I was so angry because I needed these. However, I was so angry I crushed them both! DO NOT BUY WILL NOT CALIBRATE!

Does what it says it should do. Decent for the price although I just use it as back up now... It will get you started growing plants hydroponically though.

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I’ve purchased several different pH pens and I’m very unhappy with this one due to wildly inaccurate readings. Calibrating has not helped and I’ve had no response from the seller to date. I don’t recommend.