Vinmetrica SC-300 Sulfite & pH/TA Wine Analyzer Kit

(1 customer review)


The Vinmetrica SC-300 analyzer gives accurate SO2, pH and TA values. Kit includes everything to perform ~50 sulfite tests & 30 TA tests: SC-300 meter, both electrodes, all reagents, pipettes, syringe and beaker.

In stock (can be backordered)


The Vinmetrica SC-300 SO2 & pH/TA Wine Analyzer Kit

The SC-300 analyzer gives accurate SO2, pH and TA values. Kit includes everything to perform about 50 sulfite tests and 30 TA tests: both electrodes, all reagents, pipettes, syringe and beaker.

SC-300 Manual
SC-300 SO2 & pH/TA How-To Videos

One lean, mean, wine analyzing machine. The SC-300 combines the SO2 detection of the SC-100A and the pH/TA analysis of the SC-200 into one power-packed instrument.

It’s built on the same hardware and software as our other two analyzers, so the accuracy is superb. And it’s just as easy to use! The audible buzzer and visual stop light will automatically let you know when you’re tests are done!

Because it does not rely on a color change, the SC-300 eliminates the guesswork in Ripper sulfite tests, especially in red wines!

Complete Wine Testing Kit:
Includes Everything Needed to Analyze Sulfite (SO2)(~50 tests), pH and TA (Titratable Acidity)(~30 Tests) levels in Your Wines & Musts:

  • The SC-300 SO2 & pH/TA Meter
  • SO2 & pH/TA reagent sets
  • Replacement pH electrode storage solution
  • Two titration beakers
  • Two 5 mL syringes
  • Two transfer pipettes
  • a SO2 electrode
  • a pH electrode
  • 25 mL sampling pipette (for SO2)
  • 5 mL sampling pipette (for pH/TA)
  • The Vinmetrica SC-300 Manual


Additional Tests: The SC-300 can also perform tests for residual sugar and dissolved oxygen with the addition of the Vinmetrica Residual Sugar Assay and Vinmetrica Dissolved Oxygen System.


Need Labware? Check out our Deluxe Lab Accessory Kit.


A Quick Overview – Wine Analysis Procedures with the SC-300:

Easy SO2 Test

  1. Press the power button, change to SO2 mode and press enter.
  2. Attach SO2 electrode. Draw up 5 mL of titrant into the syringe and place 25 mL of wine in beaker.
  3. Add ~2 mL of the acidifier and ~2 mL of the reactant to wine.
  4. Place and hold the SO2 electrode in the wine sample and swirl beaker.
  5. Add titrant from syringe dropwise until 15 second long endpoint signal reached.
  6. Multiply the titration volume by 20, the SO2 conversion factor, results in ppm Free SO2.

Simple pH Test

  1. Attach the pH electrode, set aside storage solution, rinse with DI water and blot gently with a paper towel.
  2. Press the power button then press the ‘Mode’ button and switch the SC-300 into ‘Cal’ mode.
  3. Calibrate using the pH 4 and pH 7 reference standards provided. Put the SC-300 in pH mode.
  4. Take a 5 mL sample of wine, place it in the beaker. Take a pH reading.

Accurate TA Test

  1. For the TA test, withdraw 5 mL of the TA Titrant with the syringe.
  2. Take 5 mL wine sample and add ~15 mL of deionized water.
  3. Put SC-300 into TA mode, place clean pH electrode gently in solution.
  4. Add TA Titrant from the syringe dropwise until the endpoint is reached indicated with the visual and audible signals. Record the volume (in mL) of titrant used.
  5. Multiply the titration volume by 2, the TA conversion factor, results in g/L Tartaric Acid.
Interested in testing something other than wine? The SC-200 can be used to test beer, cider or any other beverages, you just need to know what Acid you’re testing for.
For example, you can do pH and TA on beer with the SC-200. The pH is independent of the beverage or whatever solution it’s measuring.  The TA is also; it’s just a matter of how you calculate the final answer.   Wine TA is usually reported as tartaric acid but the titration actually measures acidity as equivalents per liter (eq/L). If you assume the acid is mostly tartaric (true for wine) then you use the conversion factor for tartaric acid (75), as we do in our kit. For measuring the acidity levels in a sour beer you would use the factor for lactic acid (90). So you could just convert as:          g/L lactic = 90/75 * g/L tartaric. To determine the conversion factor for the acid you are looking for, simply look up the molecular weight of the acid. The molecular weight of Lactic Acid is 90, so that is why we used it in the equation above.

How It Works

The SO2 function improves on the tried and true Ripper Method by eliminating the guesswork in colorimetric analysis and replacing it with digital detection indicators.

It uses an amperometric electrode and replaces the iodine reagent with a more stable reagent. Its ease of use and accurate amperometric titration method vastly improves on the original Ripper Method.

The SO2 Titrant reacts with the sulfite in the wine. When all the free SO2 is titrated, the endpoint is signalled by visual and audible indicators. The test endpoint is much more sensitive than the starch endpoint commonly employed for sulfite titrations. It’s sharp and clear, even when titrating red wines and musts.

Once the syringe titration is complete, determine the titration volume (which is the difference of titrant you started with and its final reading on the syringe) and multiply it by20(the conversion factor).

The conversion factor takes into account the known concentration of the titrant and some simple unit conversions to determine the ppm Free SO2 in your wine sample. So for example if you used 1.2 mL of SO2 Titrant during the titration, your equation would look like this:

1.2 mL X 20 = 24 ppm Free SO2

The SC-300 also includes a pH electrode and reagents for calibration and determination of pH and titratable acidity (TA) values in wines and other samples. The pH value is simply determined by placing the calibrated electrode into a sample and reading the value. TA is determined by titrating a 5 mL sample of wine to an endpoint pH of 8.2* with the TA titrant (0.13N NaOH) from the syringe in the kit. From the known concentration of the TA titrant and its volume required to reach the endpoint, the TA is simply calculated (results are in units of g/L tartaric acid).

Watch our How-To Videos for the SC-300

How to Test for SO2

How to Calibrate pH Electrode

How to Measure pH of Wine

How to Test Wine for TA (Titratable Acid)



  • Sensitivity: detects less than 2 ppm Free or Total SO2 in a 25 mL sample
  • Accuracy: +/- 2 ppm Free or Total SO2


  • pH range: 1.0 to 13.
  • Accuracy: better than 0.02 pH unit.
  • Autocalibrate on pH 3.00, 4.01, 7.00, 10.00
  • TA mode: Accuracy: +/- 0.2 g/L Tartaric acid.
  • Sensitivity: Detects down to 0.2 g/L Tartaric Acid

Why Choose Vinmetrica’s SC-300?

Where else will you find a single, compact instrument that can measure sulfite (SO2), pH and TA (Titratable Acidity) levels throughout the fermentation and aging process? Even in Red Wines!

– It’s Accurate:

SO2: 2 ppm Free SO2

TA:0.2 g/L Tartaric acid

pH: better than0.02 pH units

– Quick: Less than 2 minutes per test!

– Easy to use: No mystery solutions, pumps or tubing.

– Affordable: About a $1 per test!*

– Dependable: All of our instruments come with a 2 year warranty. The pH/TA and SO2 electrodes come with a 1 year warranty, and reagents come with a 6 month warranty.

* SO2 (Sulfite) tests cost less than 75 / test (the cost of the reagents per test). If you do a combined pH and TA analysis, the cost of reagents for the pH/TA test is approximately $1.12 / test.

For more details:

Check out the SC-300 Manual

Simple as that!

We’re Here For You

Customer Support is available Monday through Saturday 9 am – 5 pm!

We are committed to providing the best support for our products. We hope that we can assist you in making our products work for you. If contacting us after hours or on Sunday, feel free to leave a message, by phone or email, and we will return it as soon as we can. Our contact info is below!

Return to Products Page

Additional information

Weight 3.5 lbs
Dimensions 12 × 8 × 6 in

1 review for Vinmetrica SC-300 Sulfite & pH/TA Wine Analyzer Kit

  1. Mike Rinker

    I want to let others know that the SC-300 is a great instrument for home winemakers (and small commercial winemakers). I purchased the SC-300 shortly after it came out. I have been making wine continuously since 1992, and there was a huge step function in the quality of my wines when I started using the SC-300. I could actually get quick and accurate measurements on pH and TA during fermentation which allowed me to make adjustments before fermentation started. And the sulfite probe has allowed me to very effectively manage aging in barrels. The device is an absolute necessity if one really is serious about improving their wines.

    The service that the Vinmetrica team provides is outstanding. Since I had an older model, at one point I sent it in for firmware upgrades, and the turnaround on their service was extremely fast, and the price for the firmware upgrades (about 5-6 years ago) was dirt cheap.

    There is nothing on the market at an affordable price range that can compete with the SC-300, in my opinion

Add a review

Your email address will not be published. Required fields are marked *

You may also like…