Comments by "fialee8" (@fialee8) on "Japan vs German Pliers (LINEMAN)? Knipex vs Vampliers, Fujita, Milwaukee, DeWalt, Channellock" video.
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While not the sexiest product to test, what about writing instruments such as ball point, gel, and markers. It's an everyday product which everyone uses, and has several of them (often frustrating when it doesn't write, or doesn't write on certain surfaces, or it become dried out after a while). You can get them from WalMart or Amazon, and test smearing, smoothness of writing, different surfaces (metal, glass, plastic, tape, wood, cement, etc), fade resistance, temperature (freezer), amount of ink, tip durability (PSI till crushed), and case toughness (lbs to crack or snap in half). I can imagine some pretty cool testing gadgets you can build to conduct some of these tests. Brands you can test include cheapie BIC, regular pencil, Papermate, Pentel Energel, Pilot G2 or Pilot FreXion (erasable ink), Uni-Ball 207, Sharpie marker, grease pen, laundry pen, ball point, etc.
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