ETV Verfication & the testo 350 M XL

The acceptance of portable electrochemical-based analyzers by state and federal environmental agencies has been overwhelming over the past decade. Numerous third party organizations have tested and evaluated the technology and found that not only does it satisfy the accuracy requirements of many compliance-testing programs, but also it offers a more affordable and better time managed solution. Coupled with great cross utilization capability that can identify improvements in the combustion, process and product quality, makes the testo 350 M/XL a truly valuable asset to any organization.

The testo 350 M/XL has been proven to be the emission analyzer leader through testing by more third party organizations than any other portable analyzer. Among these, the US EPA's Technology Verification Program is just one of many. It's no wonder it is used by more fortune 500 companies and can be used for compliance purposes under many federal and state testing scenarios.

To define the accuracy and defensibility of data collected with the testo 350 M/XL, a testing protocol is typically followed. Whether it's a federal EPA protocol, a state or local protocol, an ASTM protocol or one developed for companies specific purpose, all protocols have the objective to provide accurate data.

The testo 350 M/XL has features that make it uniquely suited to satisfy the requirements of many testing protocols. Features like automatic on-board testing programs, monitoring of the sensor temperature, and sample flow, make it easy to follow testing protocols. Utilizing the easyEmission software to collect and report the data makes your job easier.

Company/Technology NameVerification Report
and Statement
Assurance Plan
Verification Protocol
Testo, Inc.
Model 350 M/XL Portable Multi-Gas
Emission Analyzer
March 2003
Portable Gaseous Emission
January 2002
Generic Verification Protocol
for Portable Multi-Gas
September 2003



The Advanced Monitoring Systems Center has verified technologies in the categories listed below. Each category may include a variety of documents, such as verification reports and statements, test/quality assurance plans, and verification protocols.


EPA's Test Methods Category D – Historical Conditional Test Methods (CTM) Definition and overview

This category includes methods that were categorized as conditional test methods before our method categories were revised. Because some of these methods have been cited in state rules and permits under their Conditional Test Method (CTM) designation, we have created a category for them and called it "Historic Conditional Methods". This category is closed and no new methods will be added to it.

Determination of Nitrogen Oxides, Carbon Monoxide, and Oxygen Emissions from Natural Gas-Fired Engines, Boilers and Process Heaters Using Portable Analyzers. Note: Please note that there is an ASTM Method (ASTM D6522-00) that is similar to this conditional test method and we strongly encourage you to consider its use in accordance with the applicability as specified in the method. For more information, visit

EPA's CTM-034 PDF – For Periodic Monitoring O2, CO, NO, NO2 View.pdf (102 KB)

For more information, visit

To learn more about how Testo can help you with portable emission analysis, call toll-free 800-227-0729 or complete our convenient contact form.