Home Slickdeals Fluke ST120+ GFCI Socket Tester with Audible Beeper ($14.98 w/ Free Prime... Slickdeals Fluke ST120+ GFCI Socket Tester with Audible Beeper ($14.98 w/ Free Prime Ship) – $14.98 at Amazon/Lowe’s By ARCOM - 5 August 2023 28 0 SHARE Facebook Twitter Go to the deal page: Fluke ST120+ GFCI Socket Tester with Audible Beeper ($14.98 w/ Free Prime Ship) – $14.98 at Amazon/Lowe’s