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Thandar TP-600, 600 MHz Prescaler
For use with the FT-200 Frequency Counter.
But can be used with any frequency counter to
divide the input signal by a factor of 10
Allowing any counter to increase the range by X10 up to 600 MHz.

For sale for only GBP 24.99 plus shipping

Shown here with the power cable that connects to the FT-200 counter.

This shows the TP-600 being used with the FT-200 counter
(that's for sale too)
To display a 600 MHz signal on the 200 MHz max frequency counter.