Nanjing Sanneng Instrument Co., Ltd.
Tested energy meters of this manufacturer are listed below
| WO No | 2037989 |
| QUA/CAL | |
| Report No | 03-2110 (23 pages) |
| Country | China |
| Type | DDS43 and DDSF43 |
| Class (Wh) | 1 |
| Elements | 1-phase |
| Wiring | 2-wire |
| Connection | Direct connected |
| Technology | Static (electronic) |
| Frequency | 50 |
| Current | 10(60) |
| Voltage | 220 |
| Register | LCD |
| Standards | IEC 62053-21 |
| WO No | 2078839 |
| QUA/CAL | |
| Report No | 06-4036 (26 pages) |
| Country | China |
| Type | DTS43 and DSTF43 |
| Class (Wh) | 1 |
| Elements | 3-phase |
| Wiring | 4-wire |
| Connection | Direct connected |
| Technology | Static (electronic) |
| Frequency | 50 or 60 |
| Current | 10(100) |
| Voltage | 220/380 - 240/400 |
| Register | LCD |
| Standards | IEC 62053-21 |