I grow hydroponically and use this meter daily. Easy to calibrate and lasts for weeks. My only problem is taking off this black cap for the first time. I bought two of these counters and had the same problem with both. I am about to order my third meter as the current one is 5 months old and I know it will fail soon. Expensive meters fail after about 6 months, so I think the price-performance ratio is good.
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