This is a contrived project to find a use for a nice case containing a high-quality 100 microamp meter with 0-10 and 0-3 scales. Four functions have been implemented: 1. A passive voltmeter with 3, 10, 30 qnd 100V scales with an external divider. 2. Display a selected parameter from a 9600-baud input containing seven values. 3. Use the available three analog inputs of the Picaxe 18X to output a serial string 4. Write the analog values to a Secure Digital flash using the SD Writer It is powered by two internal D cells and a DC-DC converter. This does not exist anymore. The enclosure was used for the Scientech Meter

This is the front and rear of the meter:

Here are the circuit diagrams

Here is the code