Thumb Score: +10

Amazon [amazon.com] has Klein Tools GFCI Receptacle Outlet Tester w/ LCD for $16.
Shipping is free with Prime or on $35+ orders.

* Deal history:[list][*]🔥Frontpage Deal at $16 with 225 Deal Score and 17 comments[*]🔥Frontpage Deal at $20 with 135 Deal Score and 18 comments