Expros combine an Explorer tip and a Probe tip into one easy to use double ended instrument. All Nordent Expro tips are made from spring tempered stainless steel and machine ground to exacting tolerances. The millimeter measurements are precisely cut into the Probe tips. Color coding is applied to Probes under extreme temperatures so that the color penetrates the surface of the tip. Probe tips undergo additional tight tolerance grinding to achieve the desired readability for each marking. Explorers are hand sharpened to a point. All tips are then formed by hand into their final shape by expert craftsmen.