I can see this as a financial decision by not including the case or the mirror in the cost but I would of easily paid a higher price for a
precision instrument with a case. As you know Rudy, the DrumDial is a nothing more than tensiometer and requires careful handling. The fact that a few drummers requested Steven to have you produce a few prototypes cases indicates to me that one was definitely needed. My DrumDial sits in its original beat up cardboard box and I'm going out on the limb by saying the calibrating tabs may still be intact if the plastic case you designed was part of the deal.
Some tensiometers in the science field can cost up to $6000+ like the one pictured below and of course, the case is included in the price.
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