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  • 2020-02-26 10:28:24

    Kit looks good. All the parts appear to be there and the circuit board looks decent and is well-labeled. No instructions are included with the kit but that's half the fun.

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  • tholl
    US
    2020-07-17 11:59:27

    The item is of good quality. Warning: If the user intends to power this unit from a small USB charging cube, it would be advisable to place a 100uF electrolytic capacitor across the input voltage terminals. This will help the gas sensor unit's buzzer to work properly. Depending on the quality of the USB charger, the buzzer may operate with reduced volume. The addition of the capacitor will help with this problem.

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  • 2020-10-12 23:52:28

    OK.

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