The electronic hour meters, KOBOLD type series ZEC-4Z, provide economical time measurement. The input signal can be of any shape due to an integrated Schmitt trigger. The display can be read correctly even in badly lit installation positions. The negligible mounting depth means that the device takes up very little space when installed in a control cabinet or a control panel. Programming and operation is carried out with two buttons on the front panel. The buttons have been designed to allow operation even when wearing gloves.