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

Attention Valued Customers! Check Mark’s price list will be updated effective January 1, 2021. It will be posted here through December for your convenience.

Current Results:

11/25 1827 Green

11/26 1827 Green SCC

Previous Results:

11/18 1826 Blue

11/19 1826 Blue SCC

11/11 1825 Black

11/12 1825 Black SCC

11/4 1824 Green

11/5 1824 Green SCC

10/28 1823 Blue

10/29 1823 Blue SCC

10/21 1822 Black

10/22 1822 Black SCC

10/14 1821 Green

10/15 1821 Green SCC

10/7 1820 Blue

10/8 1820 Blue SCC

9/30 1819 Black

10/1 1819 Black SCC

9/23 1818 Green

9/24 1818 Green SCC

9/16 1817 Blue

9/17 1817 Blue SCC

9/9 1816 Black

9/10 1816 Black SCC

9/2 1815 Green

9/3 1815 Green SCC