Spectra Precision AL28M Auto Level with Magnetic Dampened Compensator Metal housing, rugged and reliable enough for the toughest site conditions Good optical quality, bright clear view through the telescope, easy to read in low light Magnetic damped compensator, stable and rugged, remains accurate even under vibration Bubble mirror easy to see, set up the level at comfortable eye level, the operator can still see and level the bubble Built in angle circle, use the level for turning basic angles, perform short range alignments without the need for other instrumentation