A readout device for a numeral display unit, such as a digital clock, of the type having a rotary numeral wheel with a plurality of numerals indicated thereon at successive positions angularly displaced with respect to the axis thereof is provided. The readout device is further provided with a plurality of switching means disposed about the wheel in a pattern encoded according to a given truth table. Switch means activated by said switching means are also provided for detecting the pattern and producing an electrical signal in response to the detection.
A fuel dispenser cost counter having a plurality of coaxial cost counter wheels with a 100 count first order counter wheel with ten, 36.degree. spaced, two-place identifying numerals of 00, 10, 20 . . . 90 having an angular height of 30.degree., ten-count graduations centered on the identifying numerals and intermediate five-count graduations between the identifying numerals and with both the ten-count and five-count graduations extending at least substantially the full width of the identifying numerals and such that the counter can be read without substantial readout ambiguity during a count transfer from the first order counter wheel to the next higher order counter wheel.
