This Fortune PK-20 20gx0.01g Scale with 20g Weight is a compact scale with six weighing modes, a battery indicator, auto shut off, and a 20g calibration weight. It is powered by 2 AAA batteries, which are included. 

Features 
Capacity: 20g
Accuracy: 0.001g
Size:  115 x 69 x 20 mm 
Auto Off 
6 Weighing modes 
Low battery indicator 
20g Weight included 
2 AAA Batteries included
Made By Fuzion