- Tungsten carbide moving probe | Interchangeable probe tips with hardened steel ball | Dial gauge connection Ø 8 mm | Light alloy rod with low expansion | Handle made of insulating material | Special head allows testing of holes at a distance of 2.5 mm from the bottom | Maximum precision and reliability for testing with millesimal tolerance (Japanese class A) | Maximum precision and repeatability | Traditional system with moving probe and slide transmission | Dial gauge not supplied