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Green mini tennis is the progression stage between orange low compression balls and full pressure yellow balls
negative numbers
Each kit is supplied in two polystyrene trays which keep the units organised
to signal generators equipped with 4mm socket outputs
perfect for group activities
S-Range Scaler-Timer (NBO) Green mini tennis is theA general purpose scaler timer suitable for radioactivity counting utilising Geiger Muller tubes ; and as a general purpose millisecond digital timing device with manual or electronic triggering. The bright L. E. D. has six digits, 24mm high, making it suitable for individual use or class demonstration. In the radioactivity mode an adjustable 300 to 500V E. H. T. supply for G. M. tubes. Loudspeaker sockets are also provided for use when an audible