New versions of the MK series, MK5214 and MK5215 feature a patented method of detecting the external field and suppressing the sensor output until interference has passed. The new MK is claimed to be the only T-slot sensor with a stable signal, independent of the welding duration.

The MK series fits easily into the T-slot on standard pneumatic cylinders, or equally into adapters made to fit most other common cylinder types, and does not sit proud of the slot which affords additional mechanical protection.

The short connecting cable of the weld-field-immune MK5124 and MK5125 is protected from weld spatter by a PTFE sheath, and the connector (M12 on the MK5124 and M8 on the MK5125) is coated in a highly-resistant non-stick material.