This rating applies to all ATVs (AAAA). This is the tip that you should order when purchasing the pen. I've tried many pens - the glass sensor hits hard. I recommend you just live with it and pay the extra $30 now - the original will break - not if, but when. We grow polyploids indoors, we don't need highly sensitive scientific equipment, we need more reliability. This works great! It has a low profile, flat sensor that is small and well protected. I'm planning on getting a $130 PH60S-E (Spear) so I can test the soil pH as well - looks like it can't be broken.
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