Zq-1bzq-2b is used to measure engine speed. The measuring range of electronic pulse tachometer is 0-3000 rpm and 0-2000 rpm. The accuracy is 1.5 level. The power supply is 2.4 v. the number of teeth to be measured is provided by users. The number of teeth to be measured is accumulated in hours without lighting
| Type | ZQ-1B | ZQ-2B |
| Application | For measuring engine speed, electronic pulse tachometer | |
| Measuring Range | 0-3000r/min | 0-2000r/min |
| Accuracy | 1.5 class | |
| Power | 2.4V | |
| Number of teeth tested | Provided by the user | |
| Others | No lighting | With hours accumulation, no lighting |