Ratio:10:1,12:1,15:1,16:1,18:1,20:1,24:1,25:1,30:1,36:1,40:1,50:1,80:1,100:1 Direction of dial scale:DX or SX Gauge and dial Position and Handwheel gauges SANKQ specialized in manufacturing professional with woodworking machine accessories more than 10years.such as digital position indicator, position indicators, indicators, bakelite handle and knob, lobe ball knobs with brass insert, long knobs, ...