Knowing the steepness of a slope is important when assessing avalanche danger. The Pieps 30 Degree Plus slope meter gives you a fast and accurate way of measuring the angle of a slope. Attach the slope meter to any ski pole and you can begin getting fast and accurate measurements of slope angles slope measurement is accurate to within 1deg. Also displays the current temperature. Pieps 30 Degree Plus slope meter is powered by a lithium-ion battery that has a lifetime up to 5 years.