Inch (Individuals with Setting Rings) Economical range of mechanical three point micrometers with XT (extended travel) feature on all models between 6 - 200mm capacity. This allows a wide measurement range without the need to change anvils. Both the measuring head and setting ring are UKAS calibrated (6 - 200mm range only). Blind bore measurements are available above 12.5mm. Tungsten carbide measuring faces on all 3-point heads from 12.5mm. (Micrometers with inch setting rings are available on request.)