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Excellent work!
Daniel Fefer
Contractor, Exelon
Michael is always very professional and knowledgeable.
I am always confident things will be resolved quickly with him.
Dave Patterson
Consulting Engineer (Air Quality Group), Ameren
ESC Spectrum has provided excellent engineering and procurement support.
Juan Cantu
Analyzer Specialist, ENglobal
Alex was very helpful in resolving the issues that I brought to him.
Kevin Bugay
Process Engineer, Cardinal Corporation
Even though we are only data logger users, the support staff has always been extremely nice,
very timely and completely knowledgeable on the topic at hand.
John Markely
Sr. Environmental Engineer, Kyger Creek
Very helpful, understood my issue and found the fix I needed.
Dane Ruberg
Instrument Technician, Xcel Energy
Scott is fantastic, very knowledgeable and very helpful!
Always know I am going to get the help I need when he answers the phone.
Celena Arreola
Environmental Engineer, El Paso Electric
Outstanding customer service!!!
Rick Gregory
IT Specialist/Network Admin, Calumet Specialty Partners
The customer service provided was quick and the agent sent additional information.
Ann Woods
Environmental Scientist, Agua Fria Generating Station
Excellent work!
Daniel Fefer
Contractor, Exelon
Michael is always very professional and knowledgeable.
I am always confident things will be resolved quickly with him.
Dave Patterson
Consulting Engineer (Air Quality Group), Ameren
From The Source Blog

Continuous Emissions Monitoring 101: Calibration Gas & Requirements
This article will discuss and clarify calibration gas requirements for CEMS users including, system calibration, cal gas bottles, and more.

Continuous Emissions Monitoring 101: Extractive CEMS Umbilical
Read this article to learn more about extractive CEMS umbilicals, from construction and installation to maintenance best practices.

How to Successfully Plan and Complete a Relative Accuracy Test Audit
Learn about what a Relative Accuracy Test Audit (RATA) is and what measures to take leading up to your test, the day of, and afterwards.