Sentia is able to run tests without a Wi-Fi connection. You will need to have a Wi-Fi connection when you first use Sentia so that you can download calibration data from the internet. After that, you will need to connect once every three months or so to download the latest calibration data for new strips made at our production facility. However, we recommend that you stay connected to Wi-Fi as often as possible so that your software can be upgraded when a new version is available.