Item Name: Ruler Digital Height Gauge Ruler Electronic Height Gauge Vernier Caliper. Zero Setting0N/OFF Switchmm/inch SwitchRange:0~150mm/6"With Data Output InterfaceResolution:0.01mm/0.0005"Power:one CR2032 3V batteryDIGITAL HEIGHT GAUGEFOR WOODWORKINGRANGE:0~1 50mm/6"Resolution:0.01mm/0.0005" FEATUREThis gauge is a highly accurate measuring device developed specifically for woodworking.lt can be used to set saw blade and router bit height as well as to set the distance from a router fence to the bit. Strong magnets base allows easy setting on steel jointer fences and bandsaw table MAINTENANCE INSTRUCTIONS1.Before using the Height Gauge,clean the surface of the protective sticker with dry andclean cloth (or soaked with cleaning 0)2.0perating