This device is designed to test your love for someone. According to legend, if the mysterious liquid substance will seethe when you look at the object of adoration, then your love for him is strong. But if your hands are not even conducive to raising the fluid through the tube, not to mention boiling, then your heart is cold and indifferent.
Thus, “Lubwimer” is a joking test of your feelings. In fact, the liquid seethes, if you have warm hands. If they are cold, then nothing will come of it.
"Lubwimer's" are usually bought for fun. There are 3 types of colors: red, blue and green.