SMART SENSOR Digital Tachometer 0.5~19999 Digital Speed Tachometer Contact RPM Tach Digital Photo Tachometer with LCD Backlight Display Digital Hand Tachometer sold2024 Designed for sharpening mill or 99 inches 203mm 2M Designed for sharpening mill or circular saws plus filling and finishing of metals Specifications: Item: Engine Cylinder Hone and Replacement Stones Range: 3 4" to 2 1 2" 3 4" to 2 1 2"Additional 3 replaceable 1 1 8" Inch long 220 grit stones Package Included: 1 Set x Engine Cylinder Hone w 3Pcs Stones it is convenient for measuring the lineal rate of the wire Solid structure built with durable electronic elements and light ABS plastic house Specification: Brand: SMART SENSOR Model: AR925 Measure range: 0