The On Balance CT-250 0.001g is for the consumer that needs extremely accurate scales.
Features:
Modes: Grams (g), Ounces (oz), Carats (ct), Grains (gn) , Denarius weight (dwt)
Overload protection
Backlit display
Auto shut off
Stainless steel weighing platform
Includes:
2 x AA batteries
1 x CT-250 scale
1 x Tweezers
3 x Gem weighing tray
1 x 20 gram calibration weight
1 x 50 gram calibration weight