Milwaukee MI456US PRO Mini Titrator for Titratable Acidity in Wine

ElectrochemicalSKU: MI456US

$ 675.95


Lab Grade. Accurate. Simple. Automated.

The Milwaukee MI456 PRO Mini-Titrator makes the measurement of Total Titratable Acidity simple. The MI456 PRO uses a neutralization reaction - the reaction between the acids found in wine and a base. This type of reaction forms the basis of titration methods of analysing acids. Titratable acidity is measured on a degassed sample at the end-point of 8.20 for Australian requirements and 7.00 to fulfil the requirements of the European Union. Both results are expressed as g/L tartaric acid. The MI456 PRO Mini-Titrator automatically dispenses the titrant, determines the endpoint, and completes the calculations in a fraction of the time needed for a manual titration. The MI456 PRO Mini-Titrator uses a preprogrammed method and lab grade pH electrode combined with an algorithm to determine the end of the titration reaction.

The Milwaukee PRO TA Mini Titrator offers:

Accuracy: The MI456 PRO Mini Titrator is accurate to 5% of the reading with a resolution of 0.1 g/L with a range of 0.0 to 25.0 g/L of tartaric acid. The titrator uses piston-driven pump for accurate dynamic dosing, a built-in magnetic stirrer for a faster reaction and lab grade pH electrode.

Simplicity: The MI456 PRO Mini-Titrator is designed to for simple one button operation with pre-standardized titrant and pre-measured reagents for easy set up.

Automated operation: The MI456 PRO Mini-Titrator uses a precision piston style dosing pump that dynamically adjusts the dosing volume as the voltage changes. With the MI456 PRO Mini-Titrator, you get a faster result with no need for manual intervention or calculation.

Design features:

Fast, easy to read results
Accuracy to ±5% of reading
Easy measurement: just measure the wine sample, add the reagents as directed, prepare pH probe and pump, add the stabilizer and start the titration by pressing the start button
Refillable, double junction lab grade pH electrode for fast results with a screw on cap to ensure proper storage
Automatic temperature compensation from 0.0 to 100.0 C with temperature probe included
Compact design with a footprint of just 8.2 x 8.4 inches
Built-in stirrer is automatically maintained at a speed of 1500 rpm
Built-in algorithm to analyze the shape of the electrode response and to determine the reaction completion that automatically completes the analysis, makes all the necessary calculations and assures a simple and effective interface for the user
Simple and reliable peristaltic pump that ensure high dosing repeatability with the ability to calibrate with the provided Milwaukee standards

Care and Use

pH electrodes 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 reference. If the junction hole gets clogged, the pH electrode will no longer function.

You can extend the life of your pH electrode in the following ways.

Cleaning and Storage

All pH sensors have a limited life and response time gets longer with age. Properly maintaining your pH electrode will give you fast, accurate results for longer. So, be sure to order the Milwaukee Maitenance Kit code PH-Main at checkout time! This will be needed to help clean and condition the pH electrode before use!


To minimize clogging 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 MA9015 or pH calibration buffers will help address both these issues. Do not store in tap water or 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 that to store the electrode upright to further reduce the potential for leakage.

Cleaning an Maintenance

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. We recommend regularly soaking your electrode in cleaning solution MA9016. Also:

1. Inspect the electotrode for damage or scratches, if present replace the electrode.

2. Inspect the cable. The connection cable and insulation must be intact.

3. Connectors should be clean and dry.

4. Rinse off salt deposits with water or DI water.


The pH sensing bulbs become less sensitive over time so make sure that you are calibrating regularly to keep your MI456 Mini-Titrator readings accurate. Also, calibrate after cleaning or a long period of storage.

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