Milwaukee MC120 PRO pH Monitor High Range

The Milwaukee MC120 PRO High Range pH monitor offers lab grade accuracy with an easily viewable continuous check on pH levels.  An alarm is activated when the reading is higher or lower than set point. 

Features:

• Fast, easy-to-read results with large digital LCD readout
• Accuracy to ± 0.2 pH with a full 0.0 pH to 14.0 pH range
• Set point range of 5.5 to 9.5 pH with alarm activated when reading is higher or lower than set point
• Comes with full mounting kit including probe holders
• Lab grade probe included with a double junction, gel filled design for low maintenance

Specifications:

• pH Range: 0.0 - 14.0 pH
• pH Resolution: 0.1 pH
• pH Accuracy: ± 0.2 pH
• Calibration: Manual 2 points
• Set point range: 5.5 to 9.5 pH
• Alarm Active: when reading is higher or lower than set point
• pH Electrode: MA911B/2 (included)
• Environment: 0 to 50°C / 32 to 122°F; max RH 95%
• Power Supply: 12 VDC adapter (included)
• Mounting kit (Included)
• Dimensions: 5.9 x 3.2 x 1.35 inches
• Weight: 6.3 ounces (meter only)

Milwaukee MC120 Manual

CARE AND USE

pH meters usually start performing poorly because of problems with the probe, specifically the glass sensing bulb and the reference junction.  The glass bulb loses sensitivity with use and will eventually fail, which is true of all pH probes.  The reference junction is a small hole that allows the meter to compare the sample to a reference.  If the junction hole gets clogged, the pH probe will no longer function.

The life of your pH electrode can be extended in the following ways:

1. 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 result in the junction hole getting 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 probe's cap filled with storage solution or calibration buffer and the cap tightened to prevent leakage. It is also recommended to store the electrode upright to further reduce the potential for leakage.
2. Cleaning - Residue from the sample can impact the sensitivity of the sensing bulb and clog the junction. This is especially true if the sample has a lot of organic material. It is recommended to regularly soak your electrode in cleaning solution.
3. Calibration - The pH sensing bulbs become less sensitive over time so make sure that you are calibrating regularly to keep your PRO pH meter accurate. Also, calibrate after cleaning or a long period of storage.