I have no idea how this thing knows what voltage to apply, but I've used it to test single rows, single LEDs, and entire arrays. Works for everyone.
Thermometer B.Well WF-4000 white
57 Review
Xiaomi iHealth Meter Thermometer White
24 Review
VIVREAL 4 In 1 Stud Finder Wall Scanner With LCD Display - Center Finding Beam Finder And Sound Warning For Wood, AC Wire, And Metal Studs (Black/Silver)
24 Review
Room temperature and humidity sensor Aqara Temperature and Humidity Sensor white
25 Review
Triangle Group TR918 225/45 R18 95V summer
61 Review
π Johnson Level and Tool 400EM-S 12-Inch Heavy Duty Metal Combination Square for Professionals, with Inch/Metric Measurements, Silver - 1 Square
8 Review
π CAMWAY 6 Inch Digital Caliper with LCD Display, Electronic Vernier Caliper, 150mm Stainless Steel Feeler Gauge, Plastic Digital Caliper Set for Zero Setting Inside/Outside Diameter, Depth, and Step Measurement Tool
3 Review
π² Johnson RAS-1B Johnny Square: Professional Aluminum Rafter Square, 7'', Silver - Top Quality with 1 Square
8 Review