Keith McMillen Batt-O-Meter Musician's Battery Tester



The Batt-O-Meter looks inside your instruments and 9 volt devices to measure voltage and remaining hours of use.

Will this work in your Bass?

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Fast, accurate, and easy to use, the Batt-O-Meter:

* saves you from risk and stress before a performance
* saves you money by extending the life of each battery
* saves you time by checking battery life BEFORE you take things apart
* saves the environment by reducing the number of discarded batteries

The Batt-O-Meter looks inside your instruments and 9 volt devices to measure voltage and remaining hours of use.

Quickly and accurate measure:

* how many volts a battery is delivering
* hours left before the device runs out of power
* the remaining life in any 1.5-volt or 9-volt battery

Plug the gold-plated Power Probe into the 1/4" input on most instruments and effects pedals to test the life remaining in a hard-to-reach battery.

There's more! Test more battery types with increased precision: convenient slide switch differentiates between Alkaline, Rechargeable, and Carbon Zinc batteries.

The convenient right angle 1/4" jack enables you to check a hard-to-reach battery still inside of equipment. Just 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 world's first battery tester for musicians.

(Requires 9 volt battery, not included)

Question: Where Can I Buy a Keith McMillen Batt-O-Meter Musician's Battery Tester?

Answer: You can buy this from Best Bass Gear by Calling 877-839-3531 or Emailing us at or chatting with our Bass Techs


Rate and Review this item
Verified Buyer
By Martti Lehtonen
Smart idea.This will fix a lot of half gig battery changes ( mostly guitar players)..
Verified Buyer
Bass Player
By RJMiller
Great unit, but beware that it will not test the battery life of a bass with an 18 volt preamp. The description does not explicitly state this even though it is marketed for musicians and there are basses with 18 volt preamps.
Verified Buyer
bass player
By Neil Hebert
I am very pleased with this device. Not only efficient at checking battery strength in my active bass, but also a good all purpose tester for all batteries.
Verified Buyer
Bass/guitar player
By Tom
This is a great little item. Makes life a little easier!!!
Verified Buyer
By Richard Bills
This is the easiest to use tester I have ever seen. It saves the time of having to take the batteries out.