Certified Accuracy for Opacity Monitor Testing.
NIST-traceable test filter certification, replacement filters, and test equipment for industrial emissions compliance.
Who We Are
Your Single Source for On-Stack Opacity Testing
Cal Check provides opacity monitor test equipment, new and replacement test filters, and NIST-traceable filter testing and certification services. Whether you have one monitor or a network of many different brands, Cal Check can supply all your testing needs.
All filter testing and certification uses measurements traceable to National Institute of Standards and Technology (NIST) reference materials, ensuring accurate results and regulatory compliance every time.
About Cal Check
25+
Years in Business
What We Do
Services & Products
Annual Filter Recertification
NIST-traceable recertification performed in our state-of-the-art laboratory. Recommended annually.
Replacement Test Filters
Cal Check manufactures replacement filters for opacity monitors — certified and ready to use.
Test Device Equipment
Durable test devices that mount easily and isolate the monitor from stack opacity.
On-Site Training & Support
Annual reminders, prompt problem notification, and on-site training.
Why Cal Check
The Cal Check Advantage
- Meets PS1 Requirements (ASTM D6216-03)
- Helps comply with emissions regulations
- Isolates monitor from stack during testing
- On-stack testing using certified filters
- Unparalleled customer support and service
- Annual reminders and prompt problem notification
- Customers served across all 50 states
Why Annual Recertification Matters
Opacity filters can change over time. Annual recertification ensures your monitors stay calibrated and your facility stays compliant. Cal Check provides NIST-traceable certification performed in our laboratory.
40+
Years in Business
NIST
Traceable To
Annual
Recertification Cycle
Annual Recertification
Ready for Your Annual Recertification?
Contact Cal Check to discuss your filter certification and replacement filter needs. We'll provide the right test device and filters to meet your job requirements.