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A GUI library for designing gauges, meters, oscilloscopes, plotters
...A time controlled refresh policy is supported for real-time and heavy-duty applications. The library supports caching graphical operations and stream I/O for serialization and deserialization. Ready-to-use gauge, meter, oscilloscope widgets are provided as samples as well as an editor widget for WYSIWYG design of complex dashboards. The software is based on GtkAda and cairoada, the Ada bindings to GTK+ and cairo.
Zmeter is an RS232 serial interface program for the RadioShack 22812 (46 range) Digital Multi Meter (DMM). Zmeter captures the DMM display and outputs it in ASCII text to stdout.