Ultrasonic Recording

Like $50 in materials is going for $600 - $1500.

It hasn’t worked yet.

Koz

:unamused: :wink:

I didn’t say the knowledge, skills, and time involved in making these doesn’t warrant the price tag. But, what the hey, it is what it is. And if I have fun doing difficult things, and it can save me hundreds, or a thousand, bucks in the long run, then I’ll go for it.