What is the reason why measurement markings are engraved on both the inside and outside of the stainless steel measuring cup?
I wonder why markings are engraved on the exterior as well as the inside of a non-transparent stainless steel container. This is because the utility of intentionally putting two-sided markings on a metal cup where the contents are not visible from the outside does not immediately hit home.
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It helps you immediately check the quantity not only when filling liquid while looking down from above the cup, but also when leveling your eyes from the side with the cup standing on the countertop.
It is a cup composed of two capacities: 300ml and 1.3L[1]. Unlike glass or plastic, stainless steel material has opaque walls, so the liquid level does not show through from the outside. If markings were only on the inside, you would have to bend down to look inside from above when it is placed on the surface; if they were only on the outside, it would be difficult to gauge what line it has filled up to while pouring ingredients from above.
KOINU - Homma Manufacturing's classic stainless steel measuring cup has markings engraved on both the inner and outer surfaces[2], making it comfortable to read the volume both when pouring while holding and tilting it with one hand, and when leveling your eyes with it standing flat on the surface.
It has not yet been confirmed how many ml units each marking is divided into.