The cable tester is a beautiful black circular PCB ... of things like the orientation with an STM32 powered by a coin cell battery. But it gets better: There are disconnect switches and exposed ...
Ethernet cable testers are dime a dozen ... powered by a 9 volt battery. On the “receiver” end, you take your multimeter out and measure the testpoints – TP7 should be at seven volts ...
from the battery chargers you're shopping for to circuit testers and more. Viking, on the other hand, only sells tools ...