QMTL via Amazon offers the Tacklife Outlet Power Tester
for $8.97. Coupon code "VVU7U6LV" cuts it to $5.29
. Plus, Prime members bag free shipping
. That's a buck under last month's mention and the lowest price we could find by $5. It features three indicator lights and a nominal frequency range of 50Hz to 60Hz. Deal ends December 16.