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Keith McMillen 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. Stop wasting time and money; don't ... Click To Read More About This Product



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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. 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.

  • Requires 9-volt battery; not included
  • Customer Reviews

Review Snapshot

by PowerReviews
Keith McMillenBatt-O-Meter Battery Tester

(based on 6 reviews)

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Reviewed by 6 customers

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if i would need a new one, i would buy this item again.

By Alexander

from undisclosed

Verified Buyer

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

- this tool is very useful for people with limited knowledge in electronics like me.
- aside from giving you the percentage of the battery life, it gives the number of hours you can use your pedal or active instrument (e.g. active bass guitar, acoustic guitar with active preamp, etc.) with the battery in situ.
- it is portable, easily kept in your gigbag.
- it is useful for checking out AA, AAA, and 9v batteries.
- the batt-o-meter can even check the 9v battery inside it.

- you have to make sure that the jack is plugged properly to read the instrument/pedal you have plugged it in.
- if the batt-o-meter states "SELF," it means it is reading the battery inside the batt-o-meter and not the battery in your preamp/active bass/pedal.

- the date of arrival of this item was not indicated in the guitar center site when i made my purchase.
- i made my online purchase on christmas day, 25 december 2016.
- i opted for the 2-day shipping for this item.
- this item arrived on 29 december 2016.
- please note the date/s, as it was the holiday season.

- during the time of my online search, there were only 2 sites that sells this item at the lowest cost -- yes, guitar center was 1 of these 2 sites.
- wherever you may be, you have to include the shipping fee and taxes in your computation.
- though i was down to 2 choices where to buy this, i chose guitar center based on my previous satisfactory experience at guitar center in sunset blvd.


Good Product

By Gilby

from Sherman Oaks

Verified Buyer


  • Good Value
  • Long Lasting
  • Reliable Performance


    Best Uses

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

      I really like this gadget because it gives me the peace of mind i was looking for. I have an active bass and this tells me how many playing hours i have left and the voltage, which is perfect. I won't leave my batteries in my bass until they die out, but thanks to this I will know when it is about time to change the battery

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

      It works as promised for me!

      By JEFF

      from Richmond, Va

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

      It works for me. I like it. No more worrying about when to change batteries for my axe. Thank you!

      (2 of 2 customers found this review helpful)


      Very cool

      By George

      from San Francisco, A

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

      I got this to test the batteries in my active basses and effects pedals. It works as advertised (yes, on one bass it didn't work, so i take out the battery and test it on the side. My guitar player used it on his BOSS pedals and it worked on every one of them. We found that for most part, batteries seem to last longer than we thought, so we're not changing batteries as often as we use to, so I guess we've already made our money back by not tossing out good batteries.

      (3 of 3 customers found this review helpful)


      Top Notch

      By Bruce Smith

      from Santee, CA

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

      Unlike the other individual, I find this unit to do the job, and do it well. One caveat, with some of my instruments you have to push and hold the plug in, and with others (Most of them) you can simply "Plug and Play". This unit does all it claims (but it won't hold your hand during the testing) so... I have two of them and carry one in a gig bag as well as one in my tool bag. Outstanding execution of a most needed ides.

      (4 of 7 customers found this review helpful)


      Doesn't work on any of my guitars

      By Jack

      from Exmore, Va.

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

      I bought this product because it's advertised to chech batteries in instruments that activate when you plug in 1/4". I have six guitars that operate that way and was really excited thinking this would save me the time of having to pull the batteries out of guitars to check. I was already doing that with a battery tester. Imagine my total disappointment when it did not work on either one. I emailed the company but have yet to get a response. It works okay to test batteries manually but that's not what I needed. Totally disappointed and sorry I bought this thing. I think their advertising is misleading

      Displaying reviews 1-6

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