This specific gravity kit is compatible with most full-size scales and identifies unknown gems or minerals.
This specific gravity kit identifies unknown gems and minerals. The unique setup eliminates the awkwardness of typical "weigh below" scales. Includes gem holder support, underwater weighing pan, beaker and support, test weight, tweezers and specific gravity reference chart for 300 minerals and gemstones. This listing is for the full-size "Bench Scale" with minimum 50g capacity and 3 1/4" weighing platform. (Scale not included).