The TS4 field key is a tool you can use to swap TS4 covers on your PV modules. Want to upgrade functionality or troubleshoot? This course will train you how to use the tool you need to acccomplish this. You will be trained on the dos and don'ts of using the tool, and upon completion you will receive a certificate. This certificate is required to maintain your warranty while you work on your TS4 based modules, and only takes about 10 minutes to complete.