Laserliner arcomaster angle gauges 4060cm laserliner 075131a this arcomaster angle gauge 60cm from laserliner is a digital electronic protractor with an additional integrated detachable bevel for measuring angles at places difficult to access equipped with two large illuminated lc displays the front diagonal and hence can also be read from above while a second display on the rear side allows for two sided working both displays can be rotated by pressing a button flip display by mean