Datalogic Scanning QUICKSCAN QD 2300 - Manual (Page 149)

Symbology - Specific Security Levels
Product Reference Guide 143
Redundancy Level 4
The following code types must be successfully read three times before being decoded:
Table 27. Redundancy Level 4 Code Types
Code Type Code Length
All All
*Redundancy Level 1
Redundancy Level 2
Redundancy Level 3
Redundancy Level 4