4 DIGITAL DISPLAY, SOUND LEVELdisplay:4 digitals 10mm LCD,with blue backlight parameters:Ra,Rz,Rq,RtMeasuring rangeRa,Rq:0.005-16.00um/0.020-62.99 unichRz,Rt:0.020-160.0um/0.078-629.9 unichaccurach: not more than+-10%fluctuation of display value: not more than 6%Maximum driving stroke:17.5mm/0.7 inchcutoff length(1):0.25mm/0.8mm/2.5mm optionalsize:140*52*48mmweight:about 420g SOUND LEVEL