SPI Digital Mini Protractor 
Features and Specifications:
Range: 360º; all 4 sides with 0-90º range
Dimensions: 2.2" x 2.2" x 1.2"
Resolution: 0.05º
Accuracy: 0.2º
Repeatability:2.1
Auto shut-off after 3-5 min.
zero & hold button.
Magnets on bottom and 2 side walls
Display always read up right even if the instrument is turned
 Low Battery warning
9Volt battery is included