Accustar Alpha Track Test Kit AT 100 $28, CR Best Buy
RTCA 4 Pass Charcoal Canister $20

The Accustar Alpha Track Test Kit AT 100, a long-term kit, was accurate and reliable. The RTCA, a charcoal canister, was the best of the short-term kits, so use it if time is tight, as with a pending real-estate sale. The RTCA’s results closely matched those of the calibrated radon monitor we used as a benchmark. But if you get a reading of 2 pCi/L or above from the RTCA, use a long-term test to confirm results. The Safety Siren digital meter, $120, is best for monitoring levels after mitigation.