8 to 365 day test (your choice) Unlike a charcoal radon test kit, an alpha track radon test kit is not affected by humidity Meets EPA radon proficiency program requirements Most conclusive form of radon testing kit available to measure radon Laboratory analysis fees are included in purchase price (no hidden fees) Very easy and simple to use Fast, free shipping Fast lab turnaround, the kits are processed the same day they are received Includes pre-paid shipping label to return exposed kit to lab for analysis