This online certification program is provided by InterNACHI® School (internachi.edu) to InterNACHI® members for free. To become a certified radon tester:
Only InterNACHI® Certified Inspectors are permitted to download and use InterNACHI's certification logos.
How to Perform Radon Inspections Textbook
Radon Mitigation System Inspection Checklist is on InterNACHI's home inspection checklist page as a free download. Scroll down that page to get to the radon checklist.
Download InterNACHI's Radon Test Agreement.
Download the InterNACHI Radon Test Waiver.
Download InterNACHI's free sample "Radon Test in Progress" notice.