Mitutoyo 500-196-30 Advanced Onsite Sensor (AOS) Absolute Scale Digital Caliper, 0 to 6"/0 to 150mm Measuring Range, 0.0005"/0.01mm Resolution, LCD 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