The SILVA Clinometer is a popular clinometer for all types of vehicles. It has two scales, one ±35°, and a fine tuning scale ± 5°. The SILVA clinometer is used for checking the heeling angle on sailing boats and for the power-trim check on powerboats. It is also a perfect working instrument for other applications, such as making sure that different vehicles and equipment are sitting “level” or maintain the desired angle. For angles up to ± 5°, read the top precise scale, for angles over ± 5°, use the lower scale for readings up to ±35°.