Amazon offers the Klein Tools GFCI Receptacle Tester for $16. That's a $4 low. Shipping is free for Prime members. Buy Now at Amazon Features LCD tests GFCI trip time detects wiring faults auto-hold function
| Oct 8, 2026 | $16.00 |
| Jul 27, 2026 | $20.00 |
Lowest price we've recorded: $16.00 across 2 checks.