| Model | Graduation Mark | Schematic diagram |
| WRNK-1313 WRNK-1314 WRNK-1315 WRNK-1316 | K |  |
| WREK-1313 WREK-1314 WREK-1315 WREK-1316 | E | |
| WRJK-1313 WRJK-1314 WRJK-1315 WRJK-1316 | J | |
| WRTK-1313 WRTK-1314 WRTK-1315 WRTK-1316 | T |
Note：
(1) Multipoint sheathed thermocouple's external dameter d (mm) is divided into four classes: Φ3，Φ4，Φ5 and Φ6.
(2) The ordinary multipoint thermocouple covers four spcifications: thiple-point, four-point, five-point and six-point.
