The main functions are as follows:
1. Judging and analyzing the general direction of the bullet launching point.
2. Extraction of shooting residues from suspects.
3. Display and restore the serial number of the firearms that have been filed off.
4. Make the model of bullet hole on site.
5. Extract the original evidence and disassemble the object bearing the evidence trace.
6. On-site surveying, drawing and writing records.
