1. The cylindrical part of the large head probe made from plastic and the handgrip made from aluminium. 
2. The diameter of the cylindrical part is (223 ± 0.5) mm and the height of the cylindrical part is (100 ± 0.5) mm.
3. The diameter of the handgrip is (30 ± 0.5) mm.
4. The length of the handgrip is more than 100 mm.
5. The centre of the end of the handgrip have one M6 thread. The depth of the threaded hole is at least 8 mm.