The KMI Batt O Meter Musician Battery Tester is a small device that allows musicians to test the remaining hours of battery life and voltage of 9 volt batteries while they are still inside gear with a 1/4-inch plug. The Batt-O-Meter works with almost any active instrument pickup or effects unit (stompboxes and other floor effects) that require a 9 volt battery to operate, and is turned on when a standard 1/4-inch cable is plugged into it. The Batt-O-Meter can test stand-alone batteries: 9V, 1.5V (AAA, AA), and 3V. It does this, by automatically placing the battery under an appropriate load to simulate real world usage. It works with Alkaline, Rechargable, and old school Carbon-Zinc batteries.
Stomp boxes and instruments use a standard stereo 1/4-inch phone jack and devices sense the insertion of the 1/4-inch mono plug to turn on the power. Batt-O-Meter measures the Voltage and Current to let you know how many more hours the battery will work. A micro-processor within the unit allows the device to intelligently determine the different loads that can be put on the battery and calculate the power in hours remaining. This eliminates the need for extra buttons and adaptors, and makes the Batt-O-Meter simple to use.
What is the Power Probe?
The Power Probe is not your normal 1/4 inch plug. It is a gold plated 1/4" plug specially designed to allow the Batt-O-Meter to test the unit without turning it on. This allows for far more accurate readings with a wide array of devices.