The voltage generator comprises a negative feedback loop including a programmable voltage divider having a feedback node. Accordingly, the 3D printing technique may be actively utilized for DIY in various fields, business models or the like. The measured data are examined for errors in the instrumentation. A switch is configured to the brooch member for selectively energizing and de-energizing light emitting device. For illustration purposes, the first camera pod is herein referred to as the left camera pod and the second camera pod is herein referred to as the right camera pod.