Pinpoint hanna milwaukee all good, but you need the actual units. Do not go with Pens, they suck and never read right. I know this after trying out about 10 brands... I only use actual units now. I have all Milwaukee and they work great. I have 6 and they have lasted a long time. They run 24/7 in tanks the whole time.
55 Planted Rummys,2 GBR,8 Corys,4 Discus PFR Culls
Many shrimp tanks
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Finnex Pimp #8