"Early testers" refers to people who are among the first to try or test a new product, service, or feature before it is available to the general public. Full definition
The latest of which comes from early testers of the device who, thankfully, shared some screenshots of the device's customizable settings online. (ibtimes.com)
The team took pains to mention that this offer is only for early testers who want to get in on the ground floor and don't mind playing an unfinished product. (massivelyop.com)
However, if you're one of the lucky early testers, your first ride using the service will be free (as long as your tab is under $ 20). (venturebeat.com)