DIG HOLTEST 25-30 / 0.001MM 468-167 is a device used to measure the diameter of the base with a prerequisite. In this tool required a jaw that can be set for the measurement dia meter needed and the measurement reading screen to show a measurement value. Before taking measurements with this tool, the results must be calibrated first. This hole height gauge has a large measurement of 25-30 MM. Depth measuring devices are often used in industry, factories, or workshops