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  • I'm interested in this too, because I might use one of those sensors soon. See if the links on this page are helpful: tindie.com/products/rezahussain/dormant-labs-ph-module-v2 Commented Nov 3, 2015 at 3:59
  • There seems to be a remarkable lack of information about these modules, from the eBay vendors I skimmed. I am guessing none of them knows what they do. If you could find a datasheet, that might help. Maybe if you post what sort of chips are on the board it might help narrow down what the adjustments might do. Commented Nov 3, 2015 at 4:53
  • I've mailed the seller with a request for info, will update when I get it (and write a blog post). As for the chip types, will do but I'll have to check tonight when I'm home :) Commented Nov 3, 2015 at 11:55
  • @Jerry; thanks, but that's a different module which has software calibration instead of hardware knobs. Not the same and thus not much useful info there. Commented Nov 3, 2015 at 11:56
  • I think i have exactly the same sensor and tried to reproduce the solution, but with no results. Could you share the code which made it working for you? TIA Thomas Commented Jan 26, 2016 at 20:59