Equus Products Battery Charge System Tester

4.5 stars
39 reviews ratings
By: Equus
$4.99 shipping
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Features: -Battery and charging system monitor. -Displays the condition of the battery and charging system. -Designed for 12-volt negative ground systems. -Protects the engine computer and 12-volt accessories from surges. Generic Dimensions: -6.5'' H x 1'' W x 10'' D. Dimensions: Overall Product Weight: -1 Pounds. Auto Diagnostic RED Test Tools holidays, christmas gift gifts for girls boys

About this item


  • Battery and charging system monitor
  • Displays the condition of the battery and charging system
  • Designed for 12-volt negative ground systems
  • Protects the engine computer and 12-volt accessories from surges

  • Generic Dimensions
  • 6.5'' H x 1'' W x 10'' D

  • Dimensions
  • Overall Product Weight: 1 Pounds
  • Specifications

    Shipping Weight (in pounds): 1.0
    Assembled in Country of Origin: USA or Imported
    Origin of Components: USA or Imported
    Walmart No.: 551722731

    Customer reviews

    Customer Reviews | 39 reviews | 4.5 out of 5

    4.5 stars

    39 reviews | 4.5 out of 5

    5 stars
    4 stars
    3 stars
    2 stars
    1 stars
    Would recommend to a friend




    Customer review by rtlrp12

    5.0 stars by rtlrp12

    I purchased this to monitor my 12v portable power packs I use for camping. I'm a retired Master auto technician and I used a $3000 digital lab scope to test the accuracy of the monitor. I was very surprised at the accuracy. It was right in line with the expensive unit.

    Was this review helpful? (21) (2)
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    So. Cal
    Would recommend to a friend? Yes
    Ownership:2 - 3 months
    Age:55 - 64
    Usage:Every few days
    Easy & accurate

    Customer review by santeejj

    5.0 stars by santeejj

    Easy product to use and provides very accurate readings. Served my purposes completely

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    Pharr, TX
    Would recommend to a friend? Yes
    Ownership:2 - 7 weeks
    Age:65 or older
    Usage:Every day
    A TRUE voltage monitor

    Customer review by MarineChief

    5.0 stars by MarineChief

    I bought this SPECIFICALLY because it indicated "hundredths" of volt. In this way you can really see the condition of your 12v battery & charge system. I feel that using only the single decimal does not give sufficient charge indication as 12.7v is indicative of full (100%) charge and 12.2v is already under 50% - the extra decimal digit just gives better info. Value has four stars only because I did find this in the local store (afterward) at a lower price even though searching online claimed the local to have none when I made my initial check. I suggest actually checking the physical store prior to ordering online if at all possible - you may save a few bucks and get it quicker.

    Was this review helpful? (10) (1)
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    Would recommend to a friend? Yes
    Ownership:2 - 7 weeks
    Age:55 - 64
    Usage:Every day
    1-3 of 35 total reviews See all

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    by rbryant108 11/22/2010
    • Well sort of. If you become familiar with the normal voltage drop with engine off. you can notice a draw when you step on brake or leave headlights on. There are better methods and tools to find a parasitic power draw. In a pinch it could be done.
      by poolguru7/10/2014
      Was this answer helpful? (0) (0)
    • All this battery monitor does is measure and display the voltage. It does it three ways: with a digital readout, "idiot" lights, and a voltage indicator. All batteries lose voltage over time, but a significant loss of voltage could be indicated by regular monitoring of the system voltage.
      by b6fischer3/6/2014
      Was this answer helpful? (0) (0)
    • I agree with those who answered "yes, but not directly". And probably not right away. Depending on the current draw of whatever is draining your battery, it could take from a few minutes to a few days for it to show up. But, if there is a drain of any significance, it will show up in the form of reduced battery voltage over time. Note: that test must be done when the engine is not running. If you start the engine, even briefly, the alternator will at least partially recharge the battery and you will not get an accurate reading. I used a similar battery/charging system tester to help determine that my mother in law had a slow drain on her battery that was causing the voltage to drop significantly when the car sat for 2 or 3 days. The problem turned out to be the glove compartment light that was not turning off.
      by Richard029/15/2013
      Was this answer helpful? (0) (0)
    • No. This is a volt meter, and will only read the voltage present from the battery and/or the charging system. To detect excessive power drain, you will need to use an ampere meter to read current draw.
      by PJSprog8/14/2012
      Was this answer helpful? (0) (0)
    • Sorry for the delay in giving an answer to you and hope you have (by now) found your problem. BUT, if not... to locate battery drain it is better to use an inline amp meter to check for what are called "phantom loads". These can be as simple as the radio memory or clock circuits and as complex as a stuck relay or a wire that has pinched and is bleeding to ground (hopefully not the latter as they are usually difficult to find). Anyway once you have a reading on you amp meter you can then selectively disconnect items to see if the draw diminishes or disappears - do this by fuse pulling or physical wire disconnection (hopefully through plug connector or spade terminals). GOOD LUCK !!
      by MarineChief9/15/2013
      Was this answer helpful? (3) (0)
    • Yes It Show Low Voltage Before You Start Car.
      by ModSquadApproved8/4/2012
      Was this answer helpful? (0) (1)
    • Yes, by monitoring the voltage over time you would see a voltage drop. This monitors voltage to .00 volts so a drain will so up almost immediately. You will need to wait for 10 to 20 minutes with the battery at rest before testing.
      by rtlrp1211/25/2012
      Was this answer helpful? (2) (0)
    • I believe it would because it will display a decrease in the available voltage.
      by santeejj12/13/2010
      Was this answer helpful? (0) (0)
    • Not directly. But if you have a power drain, your battery voltage will fall over time when the engine is not running. This device will let you observe the voltage and determine if it is falling. Basically, if your car can sit overnight or for a couple of days and the device is still indicating a full battery, you probably do not have a significant drain.
      by Barry39/15/2013
      Was this answer helpful? (3) (0)
    I bought a new Interstate Battery and then had this device plugged in. It gave me a full voltage reading of 14 volts but the charge indicator was just half way through. Even after driving the car for 2 days the charge level is still just halfway. What would that mean? Is anything wrong with the battery?
    by PDharek 5/8/2011
    • Also check your alternator and voltage regulator
      by cloudcroft9/5/2014
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    • With the engine on you are reading the alternator voltage. If you want to test battery voltage turn the engine off. The half way point means not too high and not too low.
      by poolguru7/10/2014
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    • If your reading was 14 Volts, then the battery monitor should have had displayed a small circle with arrow icon showing above the voltage reading. This indicates it is in Charge mode and the indicator on the right side of the screen has nothing to do with the battery. If you were to turn the car engine off and then turn the ignition to the on position (but not starting the car), then you would see a little battery icon showing above the voltage read-out, and your voltage would likely show 12.6 or so volts. Now the indicator on the right would help you "see" the state of your battery's charge.
      by b6fischer3/6/2014
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    • I think it could be the alternator, just check it, u don't have anything to loose.
      by memua6/28/2012
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    • With the engine running, the charge indicator indicates alternator output voltage, not battery voltage. That is why you are reading 14 volts or more. The graph in the middle of the range means not too low, not too high. With the engine off, battery voltage is being read and a reading of 12.6 volts should show a full or nearly full battery on the graph, which is good. (See the package illustration.)
      by Doneright1/17/2014
      Was this answer helpful? (6) (0)
    with two arrows. The instructions don't explain this. Thanks a million in advance.
    by MickyMouce 8/20/2011
    • The battery means voltage with engine off, so you can tell if the battery is charged up. The circle denotes voltage with engine on, so you can gauge alternator health.
      by poolguru7/10/2014
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    • The meter has two modes for the colored lights at the bottom: one for battery voltage and one for charging voltage. The circle with arrows shows when the meter is in "Charging" mode. The image of the batteries shows when the meter is in Battery mode. Green light shines in Charge mode between 13.3 & 14.4 volts. Green light shines in Battery mode at 12.6 volts and over.
      by b6fischer6/16/2014
      Was this answer helpful? (1) (0)
    • This has two modes. One mode is active when the engine is running and it is testing your alternator output. That is indicated by the symbol with two arrows. The other mode is active when your engine is stopped and it is testing the voltage of your battery. That is indicated by the battery symbol. It switches automatically between modes. Note that some cars have an alternator that drops its output at times to save gasoline. This device will give you a red warning light at those times and you might think your alternator is failing. Turn on your ventilation fan and you will see the alternator output return to normal.
      by Barry310/12/2014
      Was this answer helpful? (10) (0)
    • I believe that the battery symbol indicates that battery voltage is being read with the engine off, and the circle with arrows indicates that the engine is running and the alternator voltage is being read.
      by Doneright8/14/2014
      Was this answer helpful? (4) (0)
    1-3 of 6 questions See all

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