# Class overview

| Class         | Models                      | Serial range     |
| ------------- | --------------------------- | ---------------- |
| HM_1CH        | HM-300/350/400-1T           | 1121             |
| HM_2CH        | HM-600/700/800-2T           | 1141             |
| HM_4CH        | HM-1000/1200/1500-4T        | 1161             |
| HMS_1CH       | HMS-300/350/400/450/500-1T  | 1124             |
| HMS_1CHv2     | HMS-450/500-1T v2           | 1125, 1400       |
| HMS_2CH       | HMS-600/700/800/900/1000-2T | 1143, 1144, 1410 |
| HMS_4CH       | HMS-1600/1800/2000-4T       | 1164, 1420       |
| HMT_4CH       | HMT-1600/1800/2000-4T       | 1361             |
| HMT_6CH       | HMT-1800/2250-6T            | 1382             |
| HERF_1CH      | HERF 300                    | 2841             |
| HERF_2CH      | HERF 600/800                | 2821             |
| HERF_4CH      | HERF 1800                   | 2801             |