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We offer four different devices for measuring the specific gravity of gems and minerals, each suitable for particular applications, as summarized further below. After reading below about which of these devices is right for your application, click on the pictures below, or the navigation buttons above.
Hydrometer Direct Reading Balance
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 | Price: $79 |
| Min. Weight: 1 gram |
| Max. Weight: 20 grams |
| Features: Suited for field use and/or the mineral hobbyist - our most affordable unit. You must be adept at basic arithmetic and at working with numbers. |
| Price: $129 |
| Min. Weight: .15 grams - equals .75 carats |
| Max. Weight: 30 grams |
| Features: Its high degree of sensitivity makes it a good tool for gemstone identification (except for the smallest of stones), but it's also an excellent choice for mineral ID. Its direct reading feature makes it very easy to use. |
| Price of SG Kit: $79 (Your only cost if you already have an electronic scale) |
| Price of Scale: $179 to $1,495, depending on model |
| Min. Weight for SG: .02 carats to 2 carats, depending on model |
| Max. Weight: 32 to 200 grams, depending on model |
| Features: The more sensitive scales are ideal for small
gemstones. This is also the
fastest and most user-friendly of all devices featured here.
If you already have an Electronic Scale, or need a precision Electronic Scale
anyway, this is probably the best way to go for specific gravity measurements. |
| Price: $224 |
| Min. Weight for SG: About 1.5 grams |
| Max Weight: 310 grams |
| Features: Best suited for heavier mineral specimens. |
Click on this link or the navigation button above to read more About SG (Specific Gravity).
