Kronos
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- for Blackboard: Large-scale diabetes suitable for creating circles on a teaching board.
- with Pencil: It has a ring to which a pencil is adjusted, for creating circles.
- with Needle: It has a slot where a pencil tip can be attached, for creating circles.
- with Wheels: With an adjustable wheel that provides precision in creating circles, while keeping the diameter opening constant at the desired size.