The MR501 milli-ohmmeter is a universal digital ohmmeter, which is used in general resistance measurement applications.
This includes the resistance measurement of small transformers and motors, coil resistances of contactors, relays and lifting magnets, contact resistances (also available with 20 mV limitation), testing of fuses, etc. Its robust design, small size and the possibility of battery operation also allow a mobile use.
MR501毫欧计是一种通用的数字欧姆表，它是用于一般性测量中的应用。<br/>这包括小型变压器和电机的电阻测量，接触器线圈电阻、继电器、起重磁铁，接触电阻（也可用20 mV的限制），检测熔断器等强大的设计，体积小，电池操作的可能性也让移动使用。
| Range | End Value | Res. | Current | max. error |
| 10 mΩ | 19.99m | 10 Ω | 100 mA | 0.1% v.MW, ± 3 Dig. |
| 100 mΩ | 199.99m | 100 Ω | 100 mA | 0.1% v.MW, ± 2 Dig. |
| 1 Ω | 1.999 | 1 mΩ | 10 mA | 0.1% v.MW, ± 1 Dig. |
| 10 Ω | 19.99 | 10 mΩ | 10 mA | 0.1% v.MW, ± 1 Dig. |
| 100 Ω | 199.9 | 100 mΩ | 1 mA | 0.1% v.MW, ± 1 Dig. |
| 1 kΩ | 1.99K | 1 Ω | 100 µA | 0.1% v.MW, ± 1 Dig. |
| 10 kΩ | 19.99K | 10 Ω | 100 µA | 0.1% v.MW, ± 1 Dig. |
| 100 kΩ | 199.9K | 100Ω | 1 µA | 0.2% v.MW, ± 1 Dig. |
| 1 MΩ | 1.999M | 1 kΩ | 1 µA | 0.3% v.MW, ± 1 Dig. |
| 10 MΩ | 19.99M | 10 kΩ | 100 nA | 0.5% v.MW, ± 1 Dig. |
| Measuring speed | approx. 1000 ms |
| Start of measurement | continously |
| Feed line resistance | monitored, shown by LED |
| Thermoelectric current compens. | ± 50 µV |
| Dimensions | 210 x 120 x 230 mm (WxHxD) |
| Weight | approx. 3 kg (without battery) |
