The PlusLife testing system is a PCR-style testing system that has a greater accuracy than standard rapid tests. The system itself is on the pricier side, but you and a handful of friends can split the cost. My friends and I share a testing system. It lives at a friend's house, and if any of us have had a Covid exposure, recently traveled, or are about to see an at-risk friend, we visit them to test.
Other considerations:
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The PlusLife system is sensitive to changes in power levels. It is recommended to get a powerbank to operate the system off of, to mitigate any misreads due to changes in power.
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The tests themselves need to be purchased and replenished. You'll want to check in with the people in your test share