This consumer grade tester is perfect for the homeowner that loves to collect and analyze data. Watch how radon fluctuates in your home based on weather and temperature. Move it around and see how radon levels change in different rooms. Then download it to your PC and graph the results in Excel. This tester is the 2nd level in the Corentium line and includes the following features: LCD screen shows 1-day and 7-day averages, updated hourly, and long term averages over the period of up to one year Equipped with sensors for temperature, humidity, atmospheric pressure, and movement Stores up to 10 years of data at 1-hour resolution Upload to PC with a micro-USB cable (included) Includes user-friendly and Excel-compatible software for analysis and reporting Work/time exposure calculation shows what parts of the day levels are high 2 year battery life Note: This tester is not C-NRPP approved for home inspection or professional radon use.