I have been using the Extech PH110 with the flat surface replaceable electrode
for 6 months and it works great. Not knowing how accurate it would be, I check
the calibration often and it is always right on or within .02 (two hundreths).
I recalibrate with 3 buffers - 4, 7, 10. The cost is reasonable at about $100
with the calibration buffers.
Bob Hedges
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