The bosch gol 32 d professional optical level is robust reliable and ideal for outdoor use it has dust and splash protection ip54 and a fast aperture for a sharp image of the target as well as a target collimator for rough alignment the penta prism makes it easy to read the circular vial and the large focusing knob makes for easy alignment you can achieve endless gonangle settings using the knobs with friction braked rotation this product comes with adjusting pin allen key carrying