pH Monitor Mid Range w/Mounting Kit, 3.5 to 7.5 pH, 0.1 pH Resolution
The Milwaukee MC110US Mid Range pH monitor offers lab-grade accuracy with an easily viewable continuous check on pH levels with alarms.
Milwaukee pH Probe Care
pH meters usually start performing poorly because of problems with the probe. The two parts of the pH probe that cause problems are the glass sensing bulb and the reference junction.
Sensing Bulb
The glass bulb loses sensitivity with use and will eventually fail. This is true of all pH probes.
Reference Junction
The reference junction is a small hole that allows the meter to compare the sample to a reference. The reading is generated based on the electrical difference between the sample and the reference. The pH pen will no longer function if the junction hole gets clogged.
You can extend the life of your pH electrode in the following ways.
Storage
The pH probe needs to be kept hydrated. Long periods of dry storage will damage the sensitivity of the probe. Allowing the probe to dry out may also make the junction hole clogged.
Storing in pH probe storage solution or pH calibration buffers will help address both these issues.
Do not store in tap water and DI water. This will damage the sensitivity of the probe.
The best way to store the probe is with the cap filled with storage solution or calibration buffer, which is tightened to prevent leakage. It is also recommended to store the electrode upright to reduce the potential for leakage further.
Cleaning
Residue from the sample can impact the sensitivity of the sensing bulb and block the junction. This is especially true if the model has much organic material. We recommend regularly soaking the probe in the cleaning solution.
Calibration
The pH sensing bulbs become less sensitive over time, so ensure that you regularly calibrate to keep your PRO pH meter accurate. Also, calibrate after cleaning or a long period of storage.