1.cnc engraver 2engraving for marble,granmtie,sandtone,inkstone,tombstone,steles 3.water-proof, 4. ... minHigh Frequency Spindle, continuously variable transmission, low noise, complete with carving tools, and embossed carving features.machine double water circulation ... -dimensional analog display.applicable to all types of stone and marble, granite, glass, tile, metal, wood, acrylic, aluminum composite ...