made in China, cheep price, high quality DS SeriesDS20Accuracy ±2.5mm DS24Accuracy ±2.5mm DS28Accuracy ±2.0mm DS30Accuracy ±1.5mm DS32Accuracy ±1.5mm DS series auto level is a geodetic surveying instrument used for level measurement with general accuracy conforming to national standard of Class 2 or 3 . It can also be used for building engineering measurement and the mounting of large machinery. ...