Short-term test kits measure radon levels in the home for 3 to 7 days. While short-term tests do not measure the annual average level of radon, they do offer a quick and inexpensive way to "screen" radon in the home. The cost is $9.95 per kit.
Long-Term Test Kits
Long-term test kits measure radon levels in the home for a minimum of 3 months up to 1 year. Long-term tests are the best way to estimate the average amount of radon in the home during the year. The cost is $17 per kit