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Keith McMillen Instruments Batt-O-Meter Battery Tester 

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Plug the Batt-O-Meter Battery Tester into virtually any battery-operated device with a 1/4" jack input and find out if and when to change its battery...Click To Read More About This Product

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OVERVIEW

Shows the hours of life remaining on your stomboxes and active pickups without removing the battery.

Plug the Batt-O-Meter Battery Tester into virtually any battery-operated device with a 1/4" jack input and find out if and when to change its battery. Stop wasting time and money; don't guess when to change batteries; know with the Batt-O-Meter.

The Batt-O-Meter Battery Tester looks inside your active pickup instruments and 9-volt devices to measure voltage and remaining hours of use. Fast, accurate, and easy to use, the Batt-O-Meter: saves you from risk and stress of dead batteries before a performance. You'll also save money by extending the life of each battery, and save time by checking battery life before taking things apart. Feel better knowing that you're helping the environment by discarding fewer batteries.

The Keith McMillen Instruments' Batt-O-Meter also checks hard-to-reach batteries by plugging into the 1/4" input found on most guitars, basses and effects pedals.

Use the Batt-O-Meter battery tester to quickly and accurately measure how many volts a battery is delivering, the number of hours left before the power runs out, and the remaining life in any 1.5-volt or 9-volt battery. Just plug the gold-plated Power Probe into the 1/4" input on most instruments and effects pedals to test the life remaining in hard-to-reach batteries.

Test more battery types with increased precision with the Batt-O-Meter's convenient slide switch that differentiates between alkaline, rechargeable, and carbon zinc batteries. The right-angle, 1/4" jack can check a hard-to-reach battery still inside your equipment.

And, yes, Mr. Smarty Pants, the Batt-O-Meter performs a self-test of its internal battery and displays the percentage of battery life left.

FEATURES
SPECIFICATIONS

Batt-O-Meter Battery Tester

  • Requires 9-volt battery; not included
Reviews
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Review Snapshot

by PowerReviews
Keith McMillen InstrumentsBatt-O-Meter Battery Tester
 
2.9

(based on 18 reviews)

Ratings Distribution

  • 5 Stars

     

    (5)

  • 4 Stars

     

    (1)

  • 3 Stars

     

    (4)

  • 2 Stars

     

    (3)

  • 1 Stars

     

    (5)

25%

of respondents would recommend this to a friend.

Pros

No Pros

Cons

No Cons

Best Uses

No Best Uses
    • Reviewer Profile:
    • Quality oriented (8)
    • Primary use:
    • Personal (6)
    • Was this a gift?:
    • No (8)

Most Liked Positive Review

 

When it works it is great

For guitars and effects that use the ring connection of a TRS (stereo) 1/4" jack to ground the negative connection of an internal battery for turning on it works excellently. It...Read complete review

For guitars and effects that use the ring connection of a TRS (stereo) 1/4" jack to ground the negative connection of an internal battery for turning on it works excellently. It first tells you the battery type you've set, then the voltage, and then it turns on the device and measures the current flow to estimate how many hours of operation you have left (ideal before a gig!). Works great on my Boss FDR-1, Boss GE-7, Boss AD-2, and Maxon OD-808 (and likely all Tube Screamer clones). It does not work on my Boss RC-1 or TC Polytune 2. For the OD-808, if you want the hours estimate to be accurate, you need to have its mechanical foot switch set to on because the LED draws more power than the rest of the effect which runs all the time once the input jack is inserted.

VS

Most Liked Negative Review

 

Doesn't work in all active basses

Purchased this to check the battery in my active bass (Ibanez SR505). Worked fine on external batteries but gave an error when trying to check the battery in my bass. Exchanged it for...Read complete review

Purchased this to check the battery in my active bass (Ibanez SR505). Worked fine on external batteries but gave an error when trying to check the battery in my bass. Exchanged it for another - same problem. I have heard through the grapevine that this does not actually work on all active basses. Disappointing - I'm going to return it.

Reviewed by 18 customers

Displaying reviews 1-10

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4.0

When it works it is great

By Jon Fields

from Allentown, PA

About Me Quality Oriented

See all my reviews

Ask me a question

Verified Buyer

Pros

  • Good Value

Cons

    Best Uses

      Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

      For guitars and effects that use the ring connection of a TRS (stereo) 1/4" jack to ground the negative connection of an internal battery for turning on it works excellently. It first tells you the battery type you've set, then the voltage, and then it turns on the device and measures the current flow to estimate how many hours of operation you have left (ideal before a gig!). Works great on my Boss FDR-1, Boss GE-7, Boss AD-2, and Maxon OD-808 (and likely all Tube Screamer clones). It does not work on my Boss RC-1 or TC Polytune 2. For the OD-808, if you want the hours estimate to be accurate, you need to have its mechanical foot switch set to on because the LED draws more power than the rest of the effect which runs all the time once the input jack is inserted.

      • Primary use:
      • Personal
      • Was this a gift?:
      • No
       
      1.0

      Someone needs to make a better version of this thing!

      By Agall0811

      from Chicago

      About Me Quality Oriented

      See all my reviews

      Verified Reviewer

      Pros

      • Somewhat Helpful

      Cons

      • Cheap Quality
      • Not Durable
      • Not Worth The Price-point

      Best Uses

      • Travel

      Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

      I bought my first Batt-O-Metter and when it arrived it was already broken from the battery connector. Musician's Friends was kind enough to replace it. They are really cheap made and lack overall quality. I currently Have 2 of these things one for giging and the other one to stay at home as a back up. I don't know how accurate this because with some batteries there is an ERROR display and with other batteries, when checking a functional battery, it marks a different percent each time you check it. I really hope that it gets an upgrade or that another company decides to make a better version of this thing.

      • Primary use:
      • Personal
      • Was this a gift?:
      • No
       
      3.0

      Does What It Says.....Kinda :/

      By C_Scott

      from Detroit, MI

      About Me Quality Oriented

      See all my reviews

      Ask me a question

      Pros

        Cons

          Best Uses

          • Emergency Equipment
          • Having Around The House
          • High-End Equipment

          Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

          Works on both my active Fender Jazz, and Precision basses, but not on my Stingray, or Alembic. I don't use pedals or effects, and bought this strictly to test the batteries in my basses. Fortunately, it works on the Fenders, which are what I use the most. The Batt-O-Meter is a great idea, but it should work on any and all devices, or instruments you plug it in to. If it did, then I would give it a "5 Star" rating. I would cautiously recommend this to a friend.

          • Primary use:
          • Business
          • Was this a gift?:
          • No
           
          3.0

          Doesn't work in 2 of my 4 basses

          By C_Scott

          from Detroit, MI

          About Me Quality Oriented

          See all my reviews

          Ask me a question

          Verified Buyer

          Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

          Just as so many others have said, this does not work on all active basses. It doesn't work on my Alembic Spoiler, or my Ernie Ball Stingray. It does, however, work on both of my Fender's which are the ones I gig with the most, so hopefully it will be worth it. Maybe it works well with pedals, (I don't use any), but I would think with all the negative press Keith McMillen is getting on his product from guitar/bass players, he would go back to the drawing board, and get it right.

          • Was this a gift?:
          • No
           
          1.0

          Works.......NOT!!!!

          By lwa1609

          from New Mexico

          About Me Quality Oriented

          Pros

            Cons

            • Inconsistent Performance

            Best Uses

              Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

              Bought this to easily check the battery in my Gibson Songwriter which is buried inside. Oops, doesn't work on the Gibson. Nor does it work on 6 of the 7 guitars I own! Taylors, Gibsons, Martins, or Pimentel. Only one guitar, a Yamaha CPX15S with an LR Baggs preamp proved to work correctly with the Batt-O-Meter! Also, doesn't work with my para DI. About all it is good for is a hard to use voltmeter if you take the battery out!!!!
              Really disappointed!

              • Primary use:
              • Personal
              • Was this a gift?:
              • No
               
              3.0

              Pretty good product.

              By Bassman E

              from Laurel, MD

              About Me Quality Oriented

              See all my reviews

              Ask me a question

              Verified Buyer

              Pros

              • Able To View Battery Life

              Cons

              • Can't Insert All The Way

              Best Uses

                Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

                I was disappointed when I first got the meter because when I pushed it in all the way in my guitar, I didn't give a reading. However after reading another review from another customer who bought the meter, I discovered that if I partially pushed it in, it would give a reading although the readings aren't consistent. I'm hoping they are close enough to be fairly accurate.

                • Primary use:
                • Personal
                • Was this a gift?:
                • No
                 
                2.0

                Disappointed

                By Bassman E

                from Laurel, MD

                About Me Quality Oriented

                See all my reviews

                Ask me a question

                Pros

                • none

                Cons

                • Have To Take Battery Out

                Best Uses

                • Not Worth The Money

                Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

                I just got this meter and I was disappointed because I thought I could just plug it into my active Soundgear 405QM bass guitar and get a reading on the 9-Volt battery. As it turned out, I have to take the battery out of the guitar and manually test the battery with the meter. I bought this item for convenience and it certainly is not convenient.

                • Primary use:
                • Personal
                • Was this a gift?:
                • No

                (3 of 3 customers found this review helpful)

                 
                1.0

                Doesn't work in all active basses

                By Tim

                from Santa Rosa, CA

                About Me Quality Oriented

                Verified Buyer

                Pros

                  Cons

                  • Inconsistent Performance

                  Best Uses

                    Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

                    Purchased this to check the battery in my active bass (Ibanez SR505). Worked fine on external batteries but gave an error when trying to check the battery in my bass. Exchanged it for another - same problem. I have heard through the grapevine that this does not actually work on all active basses. Disappointing - I'm going to return it.

                    • Primary use:
                    • Personal
                    • Was this a gift?:
                    • No

                    (2 of 2 customers found this review helpful)

                     
                    2.0

                    works sometimes

                    By Zippy-9IfRS

                    from Illinois

                    See all my reviews

                    Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

                    I expected this thing to work on all my guitars but it does not. I watched a vid about this problem on youtube and figured it was them and would not be me. I was wrong.
                    I have 5 electic acoustic guitars and it works on two of them--one other one also but only if I wiggle it to a perfect spot. I like the idea of it but the contact is not good enough to touch what it needs to touch on all guitars.
                    It needs improvement but after all this time (two years) I have seen no desigh changes.
                    So, I would only recommend it if you can accept being able to check some guitars and not others. Which ones? Who knows!

                     
                    2.0

                    Kind of sort of works

                    Comments about Keith McMillen Instruments Batt-O-Meter Battery Tester:

                    Bought so I'd be for-sure for-sure that i dont need to change a battery during a gig. This unit does not gain my confidence. Gave me two totally different readings on my Modulus 9V bass preamp. Did not work at all on my acoustic electric guitar. Seems to work on some other instruments, but I feel like i dont really know the score with this device. Seems like it needs a tech revision. Great idea though.

                    Displaying reviews 1-10

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