Graphical Multimeters - Unbranded ET828 / KKMoon KKM828 / Mustool MT8208 and DIY pulse sensor

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A few examples of how graphical multimeters can be really useful out in the field, where more advanced proper oscilloscopes might not be quite so convenient.
Also, a quick look at a DIY Pulse Sensor which can be used with these graphical multimeters to get pretty useful information about your vehicle's engine.
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Mate, its really nice to see ingenious idea for performing leakdown test without having the trouble to remove plug from each cylinder and then hearing the sound from exhaust, oil cap, throttlebody etc

AbuDujana
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Great to see your DIY pulse sensor including where to use it and how to interpret the measured signal. I learned a lot. Thank you for that.

j.v.
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What a great idea and amazing tip, thank you! I'll be making one of these pretty much immediately.

anticapitalize
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Few questions:-
1. The pipe diameter with your pulse sensor is small, so we shall place it in the exhaust outlet? I have my doubts that thus smaller dia would be able to pick the exgaust pulses...if you can throw some light.
2. What if we plug this sensor in any of the inlets of intake manifold, ; would this give us any idea about intake valve deterioration?
3. Please share part number of the pulse sensor with manufacturer, if possible....will help a lot....

By the way, it was very informative video but at the same time it was quite brief....

AbuDujana