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Amazon has Klein Tools Non-Contact Low Voltage Tester Pen & GFCI Outlet Kit (NCVT1XTKIT) for $19.98. Shipping is free w/ Prime or on $35+.

Thanks to Deal Hunter gaamn114 for finding this deal

Features:[LIST][*]Voltage Tester provides non-contact detection of 70 to 1000V AC in cables, cords, circuit breakers, lighting fixtures, switches, non tamper-resistant outlets and wires