20 ga steel construction. Wt.: 2-1/2 lbs. F-1 Chrony: The low priced champ. Bright green. Gives numbered shot velocities. Velocity stays on display until you shoot again. Stereo jack for optional Remote Control or Printer. Upgrades to any model. Uses one 9 volt alkaline battery with 48 hours of continuous use. Gamma Chrony: All F-1 features plus: 1 String, from 2 to 32 shot memory(Numbered). Measures high, low and average velocities, extreme spread and standard deviations. Retrieval of individual shot velocity measurements. Can be switched off, taken home and switched on for reviewing, information retrieval or (together) with optional IBM interface) downloading onto computer. Moves instantly from string to string, interrupts shooting on any string without memory loss, each string delivers its own statistics. Forget Button to clear individual string memory instantly. Change string size. Delete individual shots, or all data from memory. Ballistic Chrony Printer. Will also print Timer-Da
