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

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
LCD tests GFCI trip time detects wiring faults auto-hold function