At Marathon Products, we care about bringing you 100% tested products that are intelligently designed with over 30 years of experience backing them. Our products are certified to ensure the highest performance and functionality.

We work by these values:

Thoroughly tested, accurate products with no-questions-asked returns
Our devices are 100% tested to ensure reliability and accuracy for both high- and low-temperature applications. We offer no-questions-asked returns in the rare event of a product malfunction.

30 years of experience in precision environmental devices
We envision, manufacture, and supply the highest quality environmental sensor products with over 30 years of experience in the industry to back their performance. Our products excel at environmental monitoring because we have the decades of experience needed to create highly accurate and functional sensors.

Certified products for ultimate performance, functionality, and reliability
All of Marathon Products’ temperature and environmental sensors come with certifications to ensure the highest quality where it matters most. Our products come with a free National Institute of Standards in Technology traceable certificate and are Title 21 Code of Federal Regulations compliant.

3c\temp Mercury Thermometer Replacement Programs Data Sheet