The Presidium Diamond Mate-C utilizes proven thermal conductivity
testing method to instantly verify authenticity of diamonds.
Same as DiamondMate-A, but with rechargeable batteries and AC adapter

The specifics:

• Pocket sized
• Low battery indication.
• Rigid, hinged storage case, plus a leatherette carrying case
• Metal detector - Intermittent tone - Measured diamond-continuous tone.
• Operates on NiCad rechargeable batteries (included) or AC/DC adapter (included).
• 1 year warranty