Measures 0 to 6" (0 to 150mm) in 0.0005" (0.01mm) increments for precision use | Digital readout LCD shows inch or metric units for versatility when measuring | Advanced onsite sensor (AOS) electromagnetic inductive sensor for resistance to dirt, oil, and water | Measures inside, outside, depth, and step values for versatility. With thumb roller. Except 500-500-10, 500-501-10,500-502-10 | Includes protective case and SR44 silver oxide battery