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Tenma 72 7290 ac adapter or battery ?

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Dajaab:
Hi everyone,

I just received a nice combo Tenma 72 7290, everything seems ok except the multimeter.
The multimeter works with an external power supply or a battery ?
It seems to be 9v
Does anyone has the same Tenma ?
Or the schematic or manual ?

Thanks in advance for your help

ledtester:
It is possible this thread is relevant:

https://www.eevblog.com/forum/reviews/metex-universal-combined-test-instrument-systemsstations-a-look-inside/

In particular starting at this post:

https://www.eevblog.com/forum/reviews/metex-universal-combined-test-instrument-systemsstations-a-look-inside/msg121973/#msg121973

Also possibly this post:

https://www.eevblog.com/forum/reviews/metex-universal-combined-test-instrument-systemsstations-a-look-inside/msg928481/#msg928481

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