Upgraded Trailer Brake Tester DC 3-72V Circuit Tester with LED Display

  3-72V and Bidirectional Voltage Testing With 3-72V DC voltage testing range, attach the alligator clamp either to negative or positive ground, red and green light indicates circuits' polarity. Buzzing Sound Alarm When doing volt testing, one sound buzzing for positive voltage direction and double sound for negative. Anti-lost Probe Cover Anti-lost Silica Gel Needle Cover was designed as a part of the spring wire, no worry about losing it during testing or storage. 140 Inch Long Enough PU Spring Wire High quality 140 inch long enough PU spring wire offers more flexibility, lighter and durable. Upgraded Trailer Brake Tester Light - DC 3-72V Circuit Tester This Heavy-Duty Digital LED Circuit Tester is designed for precision voltage testing and polarity indication, perfect for trailers, automotive circuits, and electrical diagnostics. Key Features Feature Description Wider Voltage Range Tests DC voltage from 3V to 72V, covering a