| Function | M99B |
| MAX Display | 2999 |
| Over Load Protection | √ |
| Back light,Function characters Indication | √ |
| Hold Range | √ |
| Auto power off | √ |
| Auto Scan | OHM/CAP/DIODE/BUZZER/DCV/ACV/DCA/ACA |
| DCV | 300mV/3V/30V/300V±0.8%±2,600V±1%±2 |
| ACV | 300mV/3V/30V/300V±1.2%±5,600V±1.5%±5 |
| DCA | 30mA±0.8%±5,200mA±1.2%±5,10A±3%±5 |
| ACA | 30mA±1.2%±5,300mA±1.8%±5,10A±3%±10 |
| Resistance | 300/3K/30K/300K/3MΩ±1.0%±3;30MΩ±1.2%±5 |
| CAP | 3n/30n/300n/3u/30u/300uF±3%±5;3/30mF±5%±5 |
| Continuity Buzzer | √ |
| Diode | √ |
| FREQ | 3k/30k/100kHz±0.5%±3 |
| Power Supply | AA1.5Vx2 |
| Size | 168x84x35mm |
| Weight | About 270g(include battery) |