Check Mark Laboratory

Dairy Wet Chemistry Testing

Check Mark Laboratory is a division of Dairy One and one of the leading dairy chemistry laboratories in the northeast. The laboratory conducts chemistry testing for fat, total protein, true protein, casein, total solids, lactose, titratable acidity, and direct microscopic somatic cell count.  Check Mark can analyze any liquid dairy product for these components. Please reference the sample submission form for further details.  Dairy products that Check Mark is able to analyze include (but are not limited to): heavy cream, whey, retentate, yogurt, milk replacement products, reconstituted powders, or non-bovine milk.

Please include a completed copy of the Check Mark Sample Submission Form when submitting samples.

Weekly Calibration Samples

The Check Mark laboratory manufactures raw bovine milk calibration standards each week to be used in other labs across the region. We can also develop customized calibration standards specifically for your IR analyzer to monitor your specific dairy product.

Component calibration samples are typically manufactured and shipped each Monday with results available Wednesday. Somatic cell control samples are also manufactured and shipped each Monday with results available Thursday.  

Feel free to view one of our reports posted below for an example of what our calibration sample sets typically look like. Please contact us for details, pricing, or questions. We are happy to accommodate special needs if we are able to.

For a price list or to inquire about Check Mark’s services, contact us at

Weekly Calibration Sample Results

Current Results:

4/1 1793 Blue

4/2 1793 Blue SCC

Previous Results:

3/25 1792 Black

3/26 1792 Black SCC

3/18 1791 Green

3/19 1791 Green SCC

3/11 1790 Blue

3/12 1790 Blue SCC

3/4 1789 Black

3/5 1789 Black SCC

2/26 1788 Green

2/27 1788 Green SCC

2/19 1787 Blue

2/19 1787 Blue SCC

2/12 1786 Black

2/13 1786 Black SCC