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*​Please do not send any items to us without a return authorization and instructions. Items not following the procedure cannot be processed and will be rejected.

​​Return Authorization​

Opacity Attenuator (Filter) Certification Service

From the opacity industry leader...
an easy, inexpensive and painless way to keep your opacity filters certified.

Teledyne Monitor Labs makes it easy and inexpensive for you to keep your opacity attenuators (filters) certified. Teledyne Monitor Labs offers Opacity Filter Certification Services for all major opacity monitors. This service will help you meet the requirements of 40CFR60 Appendix B, Performance Specification 1. Our state-of-the-art facilities ensures accuracy of your neutral density opacity filters by using NIST traceable standards. 40CFR60 Appendix B, Performance Specification 1 requires opacity attenuators be calibrated semi-annually

Repair Services

Complete Support for your instrumentation

Field Repair Services

  • Daily rate does not include parts consumed in repair Monday through Friday 8:00 to 5:00
  • Overtime and weekends are 1.5 times the daily rate
  • Holiday rates are 2 times the daily rate

Factory Repair Services

  • Daily rate does not include parts consumed in repair
  • Normal turn around for most products is 3 business days
  • Repairs are typically made in one day​
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