I purchased the Apera PH60 on an amazon lightning deal during their prime day sales. I know at least a couple of others here on HBT got the same meter for the same great $55 price (currently $70 "normal" price on amazon).
https://www.amazon.com/gp/product/B01ENFOIQE/?tag=skimlinks_replacement-20
It seems to hit all of the marks for a good meter as outlined in the calibration thread (https://www.homebrewtalk.com/showthread.php?t=302256) except of course, the longevity is TBD.
I conducted a stability test on it today but am not sure if I did it correctly. I left the meter in the 4 buffer for the entire 5 hours. I'm not sure if that's correct or if I should have kept it in the storage solution, and just put it in the buffer for 30s to test. Either way, here are my results:
Measurements were taken every two minutes up to the 20 minute mark, every 10 minutes until the 2 hour mark, and every 20 minutes until the 5 hour mark.
https://www.amazon.com/gp/product/B01ENFOIQE/?tag=skimlinks_replacement-20
It seems to hit all of the marks for a good meter as outlined in the calibration thread (https://www.homebrewtalk.com/showthread.php?t=302256) except of course, the longevity is TBD.
I conducted a stability test on it today but am not sure if I did it correctly. I left the meter in the 4 buffer for the entire 5 hours. I'm not sure if that's correct or if I should have kept it in the storage solution, and just put it in the buffer for 30s to test. Either way, here are my results:
Measurements were taken every two minutes up to the 20 minute mark, every 10 minutes until the 2 hour mark, and every 20 minutes until the 5 hour mark.
Code:
Time pH Temperature
0 3.97 23.5
2 3.99 23.8
4 3.99 23.9
6 3.99 23.9
8 3.99 23.9
10 3.99 24.0
12 3.98 24.0
14 3.98 24.0
16 3.98 24.0
18 3.98 24.0
20 3.98 24.0
30 3.98 24.0
40 3.98 23.9
50 3.99 23.9
60 3.99 23.8
70 3.99 23.8
80 3.98 23.7
90 3.98 23.7
100 3.98 23.6
110 3.98 23.6
120 3.99 23.6
140 3.99 23.5
160 4.00 23.5
180 4.00 23.4
200 4.01 23.4
220 4.01 23.4
240 4.00 23.2
260 4.01 23.3
280 4.00 23.2
300 4.00 23.2
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