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(111703 ratings)
93% positive over last 12 months
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Innova 3721 Battery and Charging System Monitor

4.5 4.5 out of 5 stars 2,561 ratings

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Limited Edition

Purchase options and add-ons

Brand Innova
Power Source Battery Powered
Style 12-volt
Color Limited Edition
Item Weight 0.2 Pounds

About this item

  • 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

Additional Details

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Customer ratings by feature

Easy to use
4.8 4.8
Easy to read
4.7 4.7
Accuracy
4.5 4.5

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$20.10
Get it as soon as Monday, Mar 25
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Innova 3721 Battery and Charging System Monitor
Innova 3721 Battery and Charging System Monitor
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Price-28% $20.10
List:$27.76
$17.95$13.99$28.99$8.99$32.10
Delivery
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Get it as soon as Monday, Mar 25
Customer Ratings
Easy to read
4.7
4.8
4.5
4.5
Accuracy
4.5
4.7
4.3
4.1
Sold By
Amazon.com
PartUSA
Chanketch
Kdscanner
Sunreek
Amazon.com
power source
Battery Powered
Battery Powered
Battery Powered,electric
Battery Powered
Battery Powered
measurement type
Voltmeter
Voltmeter
Multimeter
style
12-volt
Digital
For Lithium Battery
Digital
3320
weight
0.2 pounds
3.52 ounces
0.3 ounces
0.5 pounds

From the brand

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.

Product information

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Innova 3721 Battery and Charging System Monitor


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From the manufacturer

3721

INNOVA 3721 Battery and Charging System Monitor

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.

Looking for specific info?

Customer reviews

4.5 out of 5 stars
4.5 out of 5
2,561 global ratings

Customers say

Customers like the performance, readability, accuracy, and voltage of the electric circuit testing device. For example, they mention it works well, it's easy to understand, and provides accurate data. Some appreciate the value, battery information, and backlight. Opinions are mixed on quality.

AI-generated from the text of customer reviews

771 customers mention725 positive46 negative

Customers are satisfied with the performance of the electric circuit testing device. They mention that it is a simple, tremendously useful, and a great tool. Some say that the meter works perfect and is handy. Overall, most are happy with their purchase and recommend it to others.

"This works well...." Read more

"...In conclusion, this is a useful tool and I do not like to have it plugged in all the time but if you doubt your battery's health plug it in and get..." Read more

"...and now I can monitor battery voltage and charging status Works very well." Read more

"...but I can assure you from personal experience the INNOVA 3721 works flawlessly. It is also incredible easy to understand...." Read more

325 customers mention289 positive36 negative

Customers find the readability of the electric circuit testing device to be easy to understand, use, and convenient. They say it comes with excellent instructions for checking your charging system and provides quick readings with LEDs and backlit large numeric display. Customers also mention that the product is a simple and very useful device that pays for itself.

"...It does exactly what it says it will do. Very convenient and easy to carry around...." Read more

"...multimeter... small... compact.. easy to read... bright LED.. reads to 1/100 of volt.. 4 digits... ie.. 12.65... good value for the money... has..." Read more

"...It is also incredible easy to understand. The included instructions are written for drivers not auto mechanics." Read more

"...I found it to be very accurate and easy to use. However I would not leave it in the car ever...." Read more

212 customers mention179 positive33 negative

Customers like the accuracy of the electric circuit testing device. They mention it's much more accurate than their gauge and provides very accurate information. They also say the numbers are credible and the higher reading is more accurate.

"...thing but I do understand the rest of it and it is reliable and pretty accurate though the only thing I know to compare is the typical readings you..." Read more

"...however reads both voltage and current.... same accuracy... I have either in all my and siblings vehicles... I recommend my 1st choice..." Read more

"...The device was giving me very accurate information and if I hadn't continued to the dealer I would have had real problems. My car was ok...." Read more

"Although only used twice since purchasing, the item seems to be accurate and it works well...." Read more

203 customers mention179 positive24 negative

Customers like the voltage of the electric circuit testing device. They mention it's a useful product for easily checking the battery voltage and alternator voltage. The meter provides a quick indication of battery voltage, and it tells you system voltage at all times. It's also great to check for battery charge level and provides accurate readings.

"...however reads both voltage and current.... same accuracy... I have either in all my and siblings vehicles... I recommend my 1st choice..." Read more

"This product allows me to monitor my auxiliary battery on my 2022 Toyota Sienna...." Read more

"Good for keeping track of battery in RV" Read more

"The Equus 3721 is a convenient way of obtaining real-time voltage readings from your battery and alternator at a great price...." Read more

182 customers mention178 positive4 negative

Customers are satisfied with the value of the electric circuit testing device. They mention that it is well made for the money, and a cheap solution that works perfectly. Overall, customers are pleased with the performance at this price.

"...This is a good buy at $20 so get it plug it in and enjoy the readings." Read more

"...]) but it is worth every penny to have the voltmeter in a package that plugs in your car and..." Read more

"...LED.. reads to 1/100 of volt.. 4 digits... ie.. 12.65... good value for the money... has both std...." Read more

"...Damn good for the cost of this thing. The head swivels nicely, stays in place so I always have a good angle to view the readings while driving...." Read more

141 customers mention131 positive10 negative

Customers like the battery information provided by the electric circuit testing device. They say it's a quick and simple way to monitor your battery's status. The battery status indicator and light indicator gives them the battery status as soon as they turn on the ignition. The monitor also indicates the battery voltage when the motor is not running, making it easy to diagnose the battery condition and charging system of their car or truck. It displays the battery temperature 24/7, and has an LED that shows the electrical status at a glance. Customers also say it helps identify low battery power in their vehicle and travel trailer.

"This helps identify low battery power in your vehicle and travel trailer. One can plan use and charging schedules as a result." Read more

"...It feels good, the screen is bright, and is fun to watch the voltage changes with time..." Read more

"...the way it displays voltage, charge status, and has an LED that shows the electrical status at a glance as well. I highly recommend this product!..." Read more

"...For the price it is sensational. It gives me the battery status as soon as I turn on the ignition and when the motor is up and running it then gives..." Read more

108 customers mention83 positive25 negative

Customers like the backlight of the electric circuit testing device. They say the readout is large, clear, and well illuminated. Some mention that the LEDs are nice, but become useless on a running vehicle. The display backlight is very uniform and bright. Overall, most are satisfied with the backlit display and recommend it to others.

"...multimeter... small... compact.. easy to read... bright LED.. reads to 1/100 of volt.. 4 digits... ie.. 12.65... good value for the money... has..." Read more

"...The backlit display is clear and easy to view in all lighting conditions. For nighttime driving the backlight may be a bit too bright, however...." Read more

"...This is a quick one hand operation with LEDs and backlit large numeric display. No reading glasses needed...." Read more

"...in the sun so today when I tried to use it, I noticed the screen was pitch black like all the ink inside the display had leaked and nothing was..." Read more

227 customers mention154 positive73 negative

Customers are mixed about the quality of the electric circuit testing device. Some mention that it's well-made, accurate, and reliable. However, some customers have reported quality control issues and premature failures.

"...graph part of this thing but I do understand the rest of it and it is reliable and pretty accurate though the only thing I know to compare is the..." Read more

"The Innova 3721 Battery and Charging System Monitor is great! It does exactly what it says it will do. Very convenient and easy to carry around...." Read more

"...But for the premature failure, I would give it 5 stars." Read more

"...Quality control issues have been noted by others, but so far, so good." Read more

Great gadget to check your Voltage
5 Stars
Great gadget to check your Voltage
The Innova battery and charging indicator is a simple and very useful device to check your current battery behavior. For the price it’s really worth the money. You can easily follow the state of your battery based on the diagram on the back. I used it often and it’s very accurate. Compared it to other devices and also checked the battery voltage by a multimeter. It Could be a little smaller but the size is not too big. You can keep it plugged or just use as you need it. Three color indicator shows full (green), low (Charging- Red) or yellow in between. It’s made of good quality plastic. Does not look cheap! One of the best spec is that you can rotate it to an angle where you have the view. Very convenient. Recommended!!
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Top reviews from the United States

Reviewed in the United States on January 26, 2024
Color: Limited EditionVerified Purchase
Reviewed in the United States on April 13, 2018
Color: Limited EditionVerified Purchase
258 people found this helpful
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Reviewed in the United States on October 29, 2023
Color: Limited EditionVerified Purchase
Reviewed in the United States on January 16, 2024
Color: Limited EditionVerified Purchase
Reviewed in the United States on December 23, 2023
Color: Limited EditionVerified Purchase
Reviewed in the United States on January 20, 2021
Color: Limited EditionVerified Purchase
Reviewed in the United States on November 20, 2023
Color: Limited EditionVerified Purchase
Reviewed in the United States on July 8, 2023
Color: Limited EditionVerified Purchase

Top reviews from other countries

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Carlos Fernando Vasconcelos Elizalde
5.0 out of 5 stars Te mantiene informado del estado de tu batería
Reviewed in Mexico on August 11, 2021
Color: Limited EditionVerified Purchase
One person found this helpful
Report
Len
5.0 out of 5 stars Great piece of kit
Reviewed in the United Kingdom on March 12, 2022
Color: Limited EditionVerified Purchase
John Malone
5.0 out of 5 stars Good product
Reviewed in Australia on September 5, 2020
Color: Limited EditionVerified Purchase
One person found this helpful
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Amazon Customer
5.0 out of 5 stars Works fantastic for my Rv
Reviewed in Canada on May 4, 2016
Color: Limited EditionVerified Purchase
2 people found this helpful
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Gabriel
4.0 out of 5 stars Practico
Reviewed in Mexico on March 19, 2022
Color: Limited EditionVerified Purchase