ggom20

ok ! thats right as 3 points define a plane

Got some Rotring made 30 years old unused, they look new.Did clean some dried ones with ultrasonic cleaner cold water and asoft alkaline based cleaner .Na2CO3 diluted.Regards

Hello!Light plastic very good for traveling, but will it last one year , exposed to direct sunlight ?By the dog point of view:There are too many apertures in that box, I fell the wind passing trough.Regards

The "easiest" way is probably computed sound analysis.3 mikes is a good start.If the question is really about cars, use one ore many microphones with long wires and a mix table , so you can locate noise origin, .The same is possible with wireless mikes.Experienced mechanics don' t really need it, but i admit that it could be useful.Roll Royce mechanics are known to use a stethoscope.Some good Machinists knows about cutting edge state just by the noise.Regards.

Hello!Ask battery maker!In most cases they tell something like:400 cycles, 500, 1000 cycles.Depending on associated circuitry and battery type.

Hello!Okay you got it working !For more light,You might try 82 Ohms instead of 100 ohms.Or 3 Batteries witch makes 4.5v instead of 3 v.Or a different type of led , Some make more light than other.When satisfied with light,Then experiment with the probes.Regardsgg