This is the finest, professional grade refractometer you will find at any price. Comes with a cubic zirconia hemicylinder for long lasting wear and tear, and runs on 110v or 220v with built in transformer (proper plug required). Also runs on AAA batteries (not included) for those gem shows and road trips. Comes with an aluminum “anvil” design case that will protect this refractometer during your everyday travel and use. Comes with RI liquid and Polarizing Filer.