I am in the middle of a hair dryer machine design, we have some issues about imaging correct symbols in order to establish the maintenance easily with the user.
Our point of interest is designing a rigid hair conditioner, which corporates natural and elegant materials those doing their job with imperfection. So we're up to production-level product.
Our hair conditioner has two basic variables, these are speed of the fan and power of the heating resistance. We have a contradiction at this point, we could not decide how to image that kind of control. As we made a research about the issue, there are three ways to show, for instance the resistance level, one is min (or off) to max, a fader. Second one uses two static levels, I, II and III. Third one is 40 C, 80 C and 105 C as resistance temperature.
Whereas the first two are mentally bijective, third one seems more professional.
However, is it really good to use such a scientific scalar? Because, most of the users could not differ temperature and heat.
Also, interoperability and localisation is one of the obstacles, not every country use Celsius, nor Fahrenheit.
One last point to decide, we use either fader or single switches. Faders are more user-controllable, however they are expensive and tacky. In heavy usage, the reliability of the controller matters, switch owns at that challange. Also suppose these controllers are at the cylindirical handle and they are orthogonal to the cylinders revolution axis.
We appreciate any help, thank you.