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(111504 ratings)
92% 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

Customer ratings by feature

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

Frequently bought together

$20.10
Get it as soon as Sunday, Mar 17
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Innova 3721 Battery and Charging System Monitor
Innova 3721 Battery and Charging System Monitor
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Price$20.10-38% $22.69
List:$36.60
$17.95$32.10$13.99$16.99
Delivery
Get it as soon as Sunday, Mar 17
Get it as soon as Sunday, Mar 17
Get it Mar 19 - 22
Get it as soon as Sunday, Mar 17
Get it as soon as Sunday, Mar 17
Get it as soon as Sunday, Mar 17
Customer Ratings
Accuracy
4.5
3.8
4.1
4.7
4.2
Easy to use
4.8
3.8
4.3
4.6
Easy to read
4.7
4.5
4.8
4.4
Sold By
Amazon.com
Amazon.com
motohousemx
Amazon.com
Chanketch
TONNY TOOLS
power source
Battery Powered
Hand Powered
Battery Powered
Battery Powered
Battery Powered,electric
Corded Electric,battery Powered
measurement type
Multimeter
Multimeter
Voltmeter
style
12-volt
Standard
3320
Digital
12V
weight
0.2 pounds
0.19 pounds
0.5 pounds
3.52 ounces

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.


From the brand

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.

Top Brand: Innova

Highly Rated
4.4/5 star rating from 50K+ customer ratings
Trending
10K+ orders for this brand in past 3 months
Low Returns
Customers usually keep items from this brand

Important information

To report an issue with this product or seller, click here.

Customer reviews

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

Customers say

Customers like the readability, performance, value, brightness, and ease of use of the electric circuit testing device. They mention that the flexible head makes the large display easy to read, and the LCD is clear with bright blue backlight. They also appreciate the simple instructions and the ability to check your charging system. Customers are also happy with reading, and battery monitor. However, some customers differ on quality.

AI-generated from the text of customer reviews

678 customers mention626 positive52 negative

Customers are satisfied with the performance of the electric circuit testing device. They say it is a simple and very useful device that works well with relatively accurate data. It works instantly, as long as the accessory is inserted. Customers are also impressed with the accuracy and helpfulness of the device.

"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

"...used twice since purchasing, the item seems to be accurate and it works well. Quality control issues have been noted by others, but so far, so good." Read more

389 customers mention306 positive83 negative

Customers like the battery monitor. They say it is very handy at checking system voltage, and it helps to identify low battery power in their vehicle and travel trailer. The monitor also indicates the battery voltage when the motor is not running, and is very convenient to use. Customers also say that it measures exactly the voltage real time, and has a great volt readout display. They mention that the product does exactly what it says it will do, and that it helps them monitor their auxiliary battery.

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

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

"...Less guess work and distraction... I also like the estimated charge level icon... while it doesn't seem to be very consistent I'm not sure if it's..." Read more

221 customers mention212 positive9 negative

Customers find the electric circuit testing device easy to use. For example, they say it's simple to plug into any cigar lighter, comes with excellent instructions, and is easy to decipher. Some say it is a quick one-hand operation and that it is one of the best auto tools they have ever bought.

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

"...It's very easy to use and accurate.My issue began when it fell apart in the cigarette lighter socket...." 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

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

189 customers mention185 positive4 negative

Customers are satisfied with the value of the electric circuit testing device. They say it is awesome for the money and saved them hundreds of dollars.

"...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

180 customers mention177 positive3 negative

Customers are satisfied with the reading of the electric circuit testing device. They mention that it is very accurate, has good measurement accuracy, and is accurate to two decimal places. Customers also appreciate the high reading and the fact that it has two units past the decimal place.

"...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

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

160 customers mention149 positive11 negative

Customers find the readability of the electric circuit testing device to be excellent. They mention that the flexible head makes the large display easy to read, regardless of the location of the product. The swivel head makes it easy to look at, and the LCD is clear and bright. The readout is large, clear, and well illuminated. The monitor is really awesome in that the head folds up and down.

"...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

"...Fits snugly in the lighter socket, hinge is smooth, display is easily readable. Made in China. Recommended." Read more

"...Warning lights function well.Some things to note when using this tester: Standard voltage of a 12 volt battery is 12.6 volts...." Read more

"...The display is lighted and easy to read, it folds for sight adjustment so it can be angled towards the driver...." Read more

112 customers mention79 positive33 negative

Customers like the brightness of the electric circuit testing device. They say the readout is large, clear, and well illuminated. The display is backlit all the time, making it easy to view in all lighting conditions. The green-yellow-red lights are OK, and the trip point for a battery is green- yellow. Customers also like the LED status light, which can be seen from a distance.

"...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

"...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

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

218 customers mention150 positive68 negative

Customers are mixed about the quality of the electric circuit testing device. Some mention it's well made, very good value, and reliable. However, others say that the tip easily unscrews and falls apart in normal occasional use.

"...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

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

"...Help me out here. The tip so easily unscrews it falls apart in normal occasional use and falls apart in the cigarette lighter socket?..." Read more

"...Now I get exact voltage readout.Very well made and sturdy device...." 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
257 people found this helpful
Report
Reviewed in the United States on December 23, 2023
Color: Limited EditionVerified Purchase
Reviewed in the United States on January 16, 2024
Color: Limited EditionVerified Purchase
Reviewed in the United States on November 20, 2023
Color: Limited EditionVerified Purchase
Reviewed in the United States on January 20, 2021
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
Report
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