I know that depending on where your meter is made the PPMs will be different. But if you’re not sure there is only a 20 PPM difference from Hanna to Truncheon. So its really not that serious. I’m guilty of using one of those cheap $50 pens. But it has gotten me this far. When I start working again I would like a nice meter like yours. I dont know if I would just like to get a regular meter or one thats part of an automated system the adjusts your ph. If they have one that will work with an automated system that I can get later that will be even better.
I first checked this out cause I didn’t know how to read EC. Its easy in Hanna because its 50 PPM per 0.1 EC.