MS soldering tips are MIL-SPEC compliant, i.e. they are used according to MIL-STD-2000. In contrast to conventional soldering tips, they have additional insulation to ground, which avoids interference frequencies. MS soldering tips are not compatible with conventional handpieces, but must always be used with MS soldering irons.
Details
RTU 060 K L MS blade tip 6.0 x 0.4 mm MIL-SPEC version , Weller soldering tip (suitable for soldering iron WXUP MS)