Maybe they are accurate but I can't use them and with a meter I will always stagger the ph up and down just wanted to know what people think of these metersNo matter how you grow having exact pH everytime is not necessary, in fact, I vary it intentionally because different nutrients are absorbed better at different pH levels. I don't mean 5.5 one day and 6.5 the next - just a slight variance. Your eyes may be shit like you say, but I can assure you that the color of the drops are always dead on. I use the attached chart and the colors are very accurate - don't use the colors on the bottle because I found them to be off a bit. I like to pH at around 5.8, so as long as the color is orangy/yellow, it's good.
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I've had oakton, bluelab, HM, and all we're done in 2 years, bought this puppy for $27 (I believe) and it's now in its second year of living hell (I drive em like I stole em) and still ticking. In saying that I may have gotten real lucky but I'm done spending $100 bucks a pop.
Ya that was from amazon or eBay. I just ordered two more different ones that I will try and report back. As for the drops/strips, well I'm sure they work kind of lol, but I like to keep my water at 5.6,8 and the plants seem to like itI'm in uk doubt we have any cheap decent ones unless I look online I am going to buy a cheap one tomorrow just for now and a spare for when I buy another just can't wait without one untill it got delivered