User`s manual

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if you’re using as 9v battery you should replace it if it’s under 7.2v (80% of its rated value)
because its voltage and current-sourcing ability drops rapidly as it begins to run down.
The Eggtimer TRS’ built-in battery tester is designed to be used as a quick check to see if your
battery may be getting low. It is not a substitute for checking the battery with a DVM, it does
not have the accuracy that you’re going to get with a dedicated instrument. You NEED a digital
voltmeter in your tool box anyway; if you don’t have one, run out to Radio Shack and buy one,
they’re under $20.