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.

Check Mark is proud to offer a Retest Guarantee. We understand how important correct results are for you to operate your business successfully. Because of that, we welcome feedback about the results that we report to you. We will perform an additional analysis of any type at no cost if the retested result is significantly different from the original result. Please contact the laboratory for details and restrictions.

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:

7/21 1861 Black

7/22 1861 Black SCC

Previous Results:

7/14 1860 Green

7/15 1860 Green SCC

7/7 1859 Blue

7/8 1859 Blue SCC

6/30 1858 Black

7/1 1858 Black SCC

6/23 1857 Green

6/24 1857 Green SCC

6/16 1856 Blue

6/17 1856 Blue SCC

6/5 1855 Black

6/6 1855 Black SCC

6/2 1854 Green

6/3 1854 Green SCC

5/26 1853 Blue

5/27 1853 Blue SCC

5/19 1852 Black

5/20 1852 Black SCC

5/12 1851 Green

5/13 1851 Green SCC

5/5 1850 Blue

5/6 1850 Blue SCC

4/28 1849 Black

4/29 1849 Black SCC

4/21 1848 Green

4/22 1848 Green SCC

4/14 1847 Blue

4/15 1847 Blue SCC

4/7 1846 Black

4/8 1846 Black SCC

3/31 1845 Green

4/1 1845 Green SCC