Jewelry scale for  precious stone
High-precision straining resistance sensor
Standard weight auto calibration
Auto zero and auto off
(after 60 seconds of inactivity)LED display
Full tare capacity 
Low battery and overload indication
Unit:g/oz/tl/ct
Operation temperature: 10～30℃(optimum)
Power supply: 4xAAA/Adapter 6VDC 
Product N.W: 192g
Item size: 149x72x41)mm