Battery, alternator and regulator tester.
Voltage: 12-24 V
LED display:
1. (red) Voltage recognition: 12 V
2. (red) Voltage recognition: 24 V
3. (red) Battery 25%
4. (yellow) Battery 50%
5. (green) Battery 75%
6. (green) Battery 100%
7. (yellow) Low alternator
8. (green) Normal alternator
9. (flashing green) High regulator
Test connection with 25 A clamps.