Hand-held tachometers which are used for non-contact as well as contact measurement of revolutions of shafts and engines, as well as surface speed and length e. g. conveyer belts. The low cost tachometer is great for accurate measurements of revolutions, length and velocity. According to the model there are up to 10 user selectable measuring units ( min-1; rev; m/min; in/min; yd/min; ft/min; m; in; ft; yd) present in this tachometer. The unit has a manual and automatic memory. The saved readings can be recalled in the display. The electricity saving electronic of the tachometer assures a long battery durability.