2: Digit Up Down Counter

This is a low cost 4 digit presettable down counter with output and reset. The count input can be used for both low and high speed applications.

This is a low cost 4 digit Up/Down Counter. Count range is from 0000 to 9999 (counting up) or 9999 to 0000 (counting down).

This is a basic low cost counter module. Two or more may be plugged together with 6-pin sockets and harness provided. Excellent use as event counter. Has a single 3-digit display. Uses the 14553 and 14551 chips. Has count and reset switches with debounce

Complete instructions and circuit diagram for a Geiger counter meter device, which will allow you to measure radiation levels.

Radiation Alert Monitor 4 Kit or completed unit Geiger Counter

This LCD panel meter is a very flexible design that can be customized to your own VOLT meter or AMP meter needs. It may be customized to measure any voltage range, standard or not. Or you can customize it to measure input from a transducer; full details a

Recorder that can store up to 20 seconds of voice/sound