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B
uying a pH meter
 

Consider the following features when choosing a pH meter:

- A calibration facility requiring two pH buffers is essential i.e. uses pH buffer 4.0 and pH buffer 7.0 for calibration.

- Readability to pH 0.1: Readability to 0.01 is un-necessary for nutrient solutions. Further, accuracy to 0.01 is rarely achievable even when meters are properly maintained.

- Combined millivolt and pH readout.

- Replaceable electrode: This is the component that usually limits the life-span of an electronic pH meter.

- Waterproof housing is desirable.

- Automatic temperature compensation: Standard on most meters.

- Auto-off feature: For prolonging battery life.

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Related topics:

"pH Measurement & Control":

Optimum pH of nutrient solutions | Adjusting nutrient pH | Measuring pH with 'indicators' | Measuring pH with pH Meters

Calibrating pH meters | pH meter maintenance | Accuracy problems with pH meters | Buying a pH meter