Complaint
| Items | PTC-8100D | PTC-8300D | PTC-8125M | PTC-8320E | PTC-7100 | |
| Basic functions | Basic error | ○ | ○ | ○ | ○ | × |
| Creeping test | ○ | ○ | ○ | ○ | × | |
| Starting test | ○ | ○ | ○ | ○ | × | |
| Standard deviation | ○ | ○ | ○ | ○ | × | |
| Constant test | ○ | ○ | ○ | ○ | × | |
| Meter constant | ○ | ○ | ○ | ○ | × | |
| Influence test | ○ | ○ | ○ | ○ | × | |
| No load test | ○ | ○ | ○ | ○ | × | |
| Max demand test | ○ | ○ | ○ | ○ | × | |
| Repeat test | ○ | ○ | ○ | ○ | × | |
| Multi-functions test | Day time error | ☆ | ☆ | ☆ | ☆ | × |
| L/N switching | ☆ | ☆ | ☆ | ☆ | × | |
| Communication test | ☆ | ☆ | ☆ | ☆ | × | |
| Power consumption test | ☆ | ☆ | ☆ | ☆ | × | |
| High voltage | × | × | × | × | ○ | |
