The slots on the back are positioned for quick insertion of AA, C and D batteries for a quick test. green and I know the battery is operational. The 1.5V, 9V and 12V settings allow for a quick battery test of most common batteries, including car batteries. The LED backlit screen is really good. Easily switch between AC and DC with the push of a button. It's easy to test resistances. I've had cheap port charge voltmeters on 9v batteries and they didn't last long. Much cheaper and less expensive AA batteries are used for this.
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