Review on 📏 Pen-type Digital Multimeter: Versatile Electrical Tester with NCV, AC/DC Voltmeter Ammeter Ohmmeter, Resistance, Live Line Testing, Backlit Display, and Flashlight by Brian Healy

Everything worked fine at first. Read AC or DC voltage automatically. Now it only blinks when I check for DC voltage. That's why I bought it in the first place. I checked the batteries in it, they are fine. And that's just for counter testing. He probably didn't test 20 batteries. Revain's customer service was good and filed a complaint with the seller but they didn't respond for several days. Great concept but poor quality.