R&K K&R On Tour Map Measurer Adjustable declination Thermo elastic capsule for durable bubble free performance Integrated clinometer Durable ABS baseplate and mirror case Unbreakable polished aluminum sighting mirror Metal housing Rotating counter Precise metal measuring wheel Scales: 1/2 to 1; 1/4 to 1; 1/8 to 1 Inch/Feet ruler