Mnesarchus Posted September 7, 2003 Share Posted September 7, 2003 I recently acquired a pinpoint pH meter and have been tring to calibrate it for a few days now. I have bought all the calibration solutions (a pH of 4.00 and a pH of 7.00). I can get the 7.00 to work properly, but for some reason the damn display wont go any lower than 5.4, no matter how much I turn the nozzle. I need it to go to 4.00 to get accurate readings. Any help much apprechaited, thanks. Link to comment
zizmans Posted September 7, 2003 Share Posted September 7, 2003 Maybe it doesn't go that low. Have you gone to the manufacturers web site? Called them? It may help you to get help if you would of added the make and model number in your post. Link to comment
Twins Guy Posted September 7, 2003 Share Posted September 7, 2003 don't know why the hell that would be! sorry dude, in the future it would be preferable (if you're doing a saltH20 tank or any high pH tank-african cichlids) to calibrate with pH 7 and 10 solutions. if you can get your hands on some 10 try calibrating with that. i'd be curious to see how that worked. one ghetto pH 10 solution is team of mules? borax-i think its used as a detergent? old school but maybe your gramma has some under her sink? tg Link to comment
Twins Guy Posted September 7, 2003 Share Posted September 7, 2003 oh one thing-the pinpoint meter has 2 screws to adjust right? one for the neutral pH 7 solution and the other for your high or low (4 or 10). apologies if you take that the wrong way-i know you're no dummie! Link to comment
Mnesarchus Posted September 7, 2003 Author Share Posted September 7, 2003 Yeah it has two nobs and the two solutions that came with it were 4.00 and 7.00 so I assume those are the two I am supposed calibrate with. NO documentation with it BTW, a major PITA. Link to comment
Mnesarchus Posted September 7, 2003 Author Share Posted September 7, 2003 I got it working. The mistake I was making is so hilariously stupid I'm not even going to tell you. Thanks guys. Link to comment
onthefly Posted September 8, 2003 Share Posted September 8, 2003 You should try to calibrate using pH 7 and pH10 solutions...since we run our tanks in that range......you can calibrate with the pH 4 and pH 7, but it is a linear extrapolation "y=mx+b" kinda crap......and as you get too far away from that......the % error would be larger. I deal with pH meters on a daily basis! Link to comment
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