Indoor Which PH meter to choose?
- Thread starter mmoloch
- Start date
The Extech PH110 is lab quality. The Blue labs is very nice, but I think the Extech PH110 is likely the best PH meter for serious consumers. Its easy to calibrate and its accuracy is unmatched.
With one week of use I retest the calibration of the HM Digital pH-80, during this week used the meter to adjust 12 jars of 6 liters for flushes...
Retest with calibration solution 7.0 -> 7.1 (before calibrating to 7.0 wanted to test with another solution)
Retest with calibration solution 4.0 -> 4.0 (went back to test with 7.0 solution and 7.1... went back to test with 4.0 solution and was right, 4.0...
... after adjusted the pH of a 6L jar from 7.6 to 6.5 and went back to test with the calibration solution.
Retest with calibration solution 7.0 -> 7.0
Retest with calibration solution 4.0 -> 4.0
I think the problem is in the 7.0 solution, was done with the powder that came with the meter, joined the powder to 100ml of distilled water, the brand says it can be stored for 2/4 weeks and used to make 5 tests, each test with 20ml.
I'll be back in one week to retest the meter with the calibration solutions and to update the topic with the results.
Retest with calibration solution 7.0 -> 7.1 (before calibrating to 7.0 wanted to test with another solution)
Retest with calibration solution 4.0 -> 4.0 (went back to test with 7.0 solution and 7.1... went back to test with 4.0 solution and was right, 4.0...
... after adjusted the pH of a 6L jar from 7.6 to 6.5 and went back to test with the calibration solution.
Retest with calibration solution 7.0 -> 7.0
Retest with calibration solution 4.0 -> 4.0
I think the problem is in the 7.0 solution, was done with the powder that came with the meter, joined the powder to 100ml of distilled water, the brand says it can be stored for 2/4 weeks and used to make 5 tests, each test with 20ml.
I'll be back in one week to retest the meter with the calibration solutions and to update the topic with the results.
A4
11th Year Anniversary
Sorry for the late response mmoloch. Yes Bluelabs can do a one point with the 10.0 calibration fluid or a two point with the 4 & 7. It depends on the user. I like to use two point myself.
Nice test, you earn some rep points for your diligence in testing equipment!
HM Digital pH-80 - 23 days of intensive use and for the first time was slightly out of calibration:
. Tested with 7.0 solution -> 7.1 but after one minute down to 7.0
. Tested with 4.0 solution -> 4.1 and even waiting two minutes did not come down to 4.0
. Retested with 7.0 solution -> 7.1 and this time even waiting two minutes did not come down to 7.0...
... so for the first time in 23 days of intensive use needed to calibrate the meter, after calibrating to 7.0, retested with 4.0 solution -> 4.0
HM TDS AP-1 -> 15 days of intensive use and remains 100% calibrated, tested with 342ppm solution
. Tested with 7.0 solution -> 7.1 but after one minute down to 7.0
. Tested with 4.0 solution -> 4.1 and even waiting two minutes did not come down to 4.0
. Retested with 7.0 solution -> 7.1 and this time even waiting two minutes did not come down to 7.0...
... so for the first time in 23 days of intensive use needed to calibrate the meter, after calibrating to 7.0, retested with 4.0 solution -> 4.0
HM TDS AP-1 -> 15 days of intensive use and remains 100% calibrated, tested with 342ppm solution
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