Eggtimer Rocketry Flight Computer User Manual download pdf (Page 12)

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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.

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Eggtimer Rocketry Flight Computer User Manual Page 12