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1 comment of this product found across Reddit:
parsing_trees /r/Autoflowers
2 points
1970-01-20 10:13:32.896 +0000 UTC

I use an Apera PH60. Before that I was using pH test kit drops, which are quite inexpensive and still probably a lot better than the cheap pH meters. I got the 1 oz sampler with a pH up/down bundle, and then a refill for like $10 that would last years.