If you also buy a controller, an 18650 battery, and a dcdc trimmer on Ali, you get an ideal tester that is generally not a pity and dropped a couple of times, when it fell, the case just opened, but nothing critical happened Some pros: Works fast, does not bite the patch cord, the best tester for your money Different cons: It would be time to transfer such devices to 18650, I did it right away from the moment of purchase, well, I soldered the coax connector, because I forgot when I last saw it