Digital multimeter belongs to category 9 of trademark classification 09 10 group; According to the statistics of signpost network, there are 928 registered trademarks of digital multimeter. How to choose other subcategories when registering: 1. There are 9 registered trademarks (oscilloscope, group number: 09 10), accounting for 0.97%. 2. There are 8 registered trademarks (sensor, group number: 09 13), accounting for 0.86%. The registration ratio is 0.75%. 4. There are 7 registered trademarks (flowmeter, group number: 09 10), accounting for 0.75%. 5. There are 7 registered trademarks (pressure gauges, group number: 09 10), accounting for 0.75%. 6.