... , carrying case, polarizing filter, index oil, index reference list and user's manualSpecifications:Measuring Range : 1.30 - 1.81 RI Minimum Graduation ... (For 77 common gemstones, i.e. Calcite, Jadeite, Quartz etc.)- User's Manual RHG-181 Gem Refractometer w/ Built-in Light Source + RI ...