Safety first! Ideal for helping examination set polarity connectors network resources. Simply attach and soon you will see polarity. Prevent equipment damage due to faulty wiring network resources.

Specifications:
Dimensions W x H x D 40 x 60 x 15 mm
Display: LED
Connection: 3.5 / 1.35 mm, 5.5 / 2.1 low-voltage connector, 3.5mm pin plug jack