All models of the TurPulse can measure Horizontal Distance, Slope Distance, Vertical Distance, Tree Height, and Inclination. The TruPulse 360B has a built-in compass and it can also measure Azimuth, as well as the bearing, distance, and inclination between two targets. Because of the built-in compass, the TruPulse 360B is well suited for traversing, measuring stock pile volume (with optional software), and for setting offset GPS points in programs such as ArcPad. The TruPulse 360B also includes Missing Line Mode. The user shoots two targets and the TruPulse 360B calculated the bearing, distance and inclination between the two targets. This can be very helpful in situations where it is difficult or impossible to physically get to one or both of the targets. Visit www.resourcesupplyllc.com for more information and pricing. Cheaper Philips Avent Isis Breast Pump