Ideal for outdoor use due to a robust housing with dust and splash protection (IP54)Fast aperture for a sharp image of the targetCompensator lock for safe transportTarget collimator for rough alignmentPenta prism makes it easy to read the circular vialErect imageLarge focusing knob for easy alignmentFast aperture for a sharp image of the target (measuring rod)Endless gon/angle setting using knobs with friction-braked rotation