> Scaler SC-2. What is this?
If you have a little radioactivity, the GM tube goes "tic tic tic". You can count tics per minute.
When you have a LOT of radioactivity the GM tube goes "ttttttttttttttttttttttttt...", you can't count the tics. To get a number, you count by tens and hundreds, a pulse counter, to "scale" the too-rapid tics to a number.
Those gas-tube counters are mildly interesting and can be used in other ways. Can't think of any worth doing today.
The unit you have *seems* to be both a GM tube with power supply and the scaler/counter. As such it "could" be handy for studying radioactivity.