The purpose of these prototypes was to design an ergonomic studfinder with a digital display. The design decisions for the final prototypes were influenced by the OXO philosophy and existing OXO products:
Prototype 1, the Stud Finder/Leveler, was constructed from a recycled plastic container, as it roughly simulated the dimensions and shape of the proposed model. The power button and LED light placement were indicated with sticky foam, and the digital display was shown with tape. Immediately it was realized that when holding the device, a digital display would not be visible. I considered a model that did not have a digital display, however, because it violated the original design specifications, it was not implemented.
Prototype 2, the traditional-grip stud finder, was shaped more like currently available stud finders. In applying OXO design principles, variation B of the original design was chosen so that only a single button was placed in the center. Here it can be easily reached by the index finger of whichever hand you prefer to hold it with. No additional button is needed for recalibration because it does this automatically, much like Zircon technology.
Two forms of Prototype 3 were created in order to separately explore the ergonomic handle (3.1) and tilting screen (3.2). Both forms were constructed predominantly from reconstituted cardboard boxes. The buttons were made from craft foam stickers because they are good haptic indicators and were easy to attach. The LED light was made from paper. I purposely used flat materials so that they would not be conflated with buttons. Both forms also utilized the previously mentioned single-button design. User testing was preformed on prototypes 2 and 3.1 to compare how people preferred to hold the device. Similar to Prototype 1, Prototype 3.2 was merely an exercise in feasibility.
Prototype 1 was a usability failure. Users couldn't see the screen because it was covered while holding it. However, users liked the aesthetics of the design and liked the idea of a leveler combined with a stud finder. With some modification, it could be a successful screenless design.
Prototype 2 preformed well with user testing. Users could easily turn the device on and off, and could hold it easily. The results of testing showed that users preferred the grip of Prototype 3.1. It was judged to be a good size. One user said she liked it because she could fit her whole hand around it rather than dragging it over the wall like a vertical computer mouse.
A sturdier and more material-intensive version of Prototype 3.2 will be necessary to determine the precise mechanism for a tilting screen. Further considerations may also include: