The Robo Ruler is made of the same material that most electronics boards are made of. Examples include your PC motherboard, your mobile phone's board, or your laptop's electronics. The material is called FR4. FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant. Specifically, the Robo Ruler is made of FR4-Standard Tg 140C.
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