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From Niigata Seiki Co., Ltd.:
There is no advertising or extra feature is a simple level.Horizontal instrument,please use the measure of level.To this horizontal instrument is equipped with the following features.- Lock function.- 0 points reset function.In addition to the above,the following features in the paid version.- Decimal display- High-precision calibration.- Precision, change of viscosity.- Change of color.- Gradient display and angle display switching.