For inside, outside, step and depth measurement. Has metric scale to 15cm in 1mm steps and the 10 part vernier reads to 0.1mm least count. English scale is graduated to 6in in 1/16in divisions and the 8 part vernier reads to 1/128in least count. Verniers are adjustable and can be trued, if desired. Automatic cam locking device allows ï¬ne adjustment along the main scale. Made of plated steel and packed in plastic case.