Check the listing for details. Teledyne API 200E NOx Analyzer M200E Chemiluminescence Nitrogen Oxides #2. Condition: For parts or not working, Made in United States. Listed at 400.00 USD. This analyzer is missing the power supplies, reaction cell, preamp board, and O3 generator. The Motherboard/CPU/DOM assembly was tested in another unit and it self-tests and functions correctly. The cover is not shown but it is included.