This precision instrument is engineered to be accurate to within 1 degree of level or plumb. It provides a full 360 degree reading so that the unit may be used accurately, even upside down. Reading hold feature lets you take a reading in any situation. Extra large LCD readout for easy viewing. Machined aluminum frame will take just about any punishment. Batteries are included. Full 1 year warranty. 2 lbs (1Kg) shipping weight.