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INNOVA 3721 Battery and Charging System Monitor

4.6 out of 5 stars 1,331 customer reviews

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  • Easily plugs into vehicle’s cigarette lighter or power receptacle to monitor battery and charging system voltage
  • Designed for 12-volt negative ground systems
  • LCD displays measured voltage with a bar graph to indicate battery charge level
  • Color-coded LEDs quickly identify battery’s charge status
  • Head pivots for easy viewing and angle adjustment
9 new from $14.99
$17.29 Free Shipping for Prime Members
FREE Shipping
Get free shipping
Free 5-8 business-day shipping within the U.S. when you order $25 of eligible items sold or fulfilled by Amazon.
Or get 4-5 business-day shipping on this item for $6.55. (Prices may vary for AK and HI.)
Learn more about free shipping
on orders over $25—or get FREE Two-Day Shipping with Amazon Prime
In Stock. Ships from and sold by Amazon.com.

Frequently bought together

  • INNOVA 3721 Battery and Charging System Monitor
  • +
  • Roadpro 12V Battery Clip-On and Cigarette Lighter Adapter
  • +
  • Wagan 4-Way 12V Automotive Socket Extender
Total price: $44.64
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Product description

The INNOVA Battery and Charging System Monitor displays the condition of your battery and charging system instantly. It protects the engine computer and 12-volt accessories from damaging surges when jump starting or recharging. Easily plugs into the vehicle's cigarette lighter or power receptacle to monitor battery and charging system voltage. The LCD screen displays the measured voltage with a bar graph to indicate battery charge level and the color-coded LEDs quickly identify the battery's charge status. The head pivots for easy viewing and angle adjustment.


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VINE VOICEon January 24, 2013
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Enthusiast: Campingon December 13, 2014
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on July 29, 2013
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on May 9, 2016
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