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Your cart is empty.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.
JohnW
Reviewed in Australia on February 14, 2024
Very good product, works as it should.
Len
Reviewed in the United Kingdom on March 12, 2022
Gives me the information I need to check my battery & alternator condition as I've been having issues with my battery.
Carlos Fernando Vasconcelos Elizalde
Reviewed in Mexico on August 11, 2021
Para de un golpe de vista saber como esta la carga de mi Batería
John Malone
Reviewed in Australia on September 5, 2020
Item worked well. Did what was advertised.
John V.
Reviewed in the United States on April 13, 2018
The media could not be loaded.
Customer
Reviewed in Canada on May 4, 2016
Works fantastic for my Rv . I now Always know exactly the level of my battery's .I compare the voltage on the Innova 3721 with my Multimeter and it's exactly the same.Great product
Jesse Knight
Reviewed in the United States on November 11, 2010
The Honda 2005 civic has a marginal charging system. This meter is ideal for determining when it is time to turn off the radio to reduce load on the alternator. Voltage reading is very accurate, much better than 1% as measured against a small Beckman pocket meter, which in turn has been checked against a Powerex Wizard aa cell charger. Warning lights function well.Some things to note when using this tester: Standard voltage of a 12 volt battery is 12.6 volts. Some deep cycle absorbed glass mat batteries will read 12.8. This is after loading the battery by turning on the headlights for 10 seconds, to remove surface charge. Note that while the lights are on, the voltage drops quickly at first, then the voltage stabilizes. Turning off the lights causes the voltage to rise again gradually. After a few minutes the voltage will stop rising. If the voltage settles at 12.6 (or 12.8 for AGM battery) battery is charged, assuming that the battery is near 68 degrees F. Lower temps raise the voltage, higher temps lower the voltage. For a standard battery figure about 12.66 volts at 32 F and 12.54 volts at 104 F battery temperature, not air temperature.After a car has been running for awhile with no lights, radio, wipers, AC, heat or window defroster, the alternator may cycle letting the battery voltage drop for a while before kicking in. This is OK provided the charging is steady shortly after turning on the lights. An intermittant alternator will cause the red light to turn on and off when headlights are on.The bar graph for battery condition is not very useful as the meter has only voltage information.The instructions do not state that this tester is for negative ground cars only, a small quibble as positive ground is not common.Had I bought this device six months ago I could have avoided killing a brand new battery in six months.UPDATE: Still working fine as of May 21, 2013
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