This product is very durable and safe. Working model takes accurate reading for hiking or navigation This advanced Compass is highly durable as it is strongly built to last for a long period of time. Measuring vertical angles with clinometer ~ Defining points of the same elevation ~ Measuring strike and dip Brunton compass, properly known as the Brunton Pocket Transit, is a type of precision compass. Unlike most modern compasses, the Brunton Pocket Transit utilises magnetic induction damping rather than fluid to damp needle oscillation. The Brunton Pocket Transit is a specialised instrument used widely by those needing to make accurate degree and angle measurements in the field. These people are primarily geologists, but archaeologists, environmental engineers, and surveyors also make use of the Brunton's capabilities. Black Brunton Compass With Pure Black Leather Case