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People are always worrying about how much shampoo or other kind of liquid you wish to take on a trip.
Travel ruler is the answer to these problems.
Travel ruler is a scale ruler that uses the light sensor principle to detect the usage of each turn of use.
The mark on the ruler will disappear through time, this way you are able be able to figure out how much is used at one time.
Travel ruler is able to stick on and taken off any kind of bottle, so you can easily put it on any bottle you wish to bring on your trip. As a result, it is convenient to estimate how much content you will need to bring, thus reducing the weight of your package.