Sorry for being pedantic, but those foldable work rulers are exactly 2 m long (at least in MetricLandia), which is, incidentally, the span of IQ values (0-200).
So yeah, it literally can be mapped one-to-one to a (common type of) ruler.
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I got my lenses for a realistic amount (~8€), but the frames are (were) expensive af. That’s mostly on Luxottica (and the state not reigning her in).
Although, that was years ago, way before “covid-induced” inflation, and the healthcare system is being dismantled bit-by-bit for a very long time, so I don’t doubt lenses got at least 3-5x more expensive in the meantime.
Yup. There are like 3 types of rulers: normal (a stick), foldable (this) and those retractable metallic strips.
Sticks are usually either 15 or 30 cm, while the foldables are literally always 2m.
The coils are the most ubiquitous, but I orefer the foldavles for most things since they tend to fall undet their own weight when measuring longer distances. These sre either 2 or 5 m I think.