The LS790B Leak-Seeker combines the most advanced microcomputer circuitry with field-proven Ion-pump sensor technology creating a highly sensitive, accurate electronic refrigerant leak detector. Over 100 computer-generated tones and a high-intensity bar graph display quickly alerts the user to varying halogen concentrations. Patented automatic calibration design eliminates the need for manual balance or tick rate adjustments while the user-selectable 10 sensitivity ranges enable the LS790B Leak-Seeker to detect all non-combustible CFC, HCFC, HFC gases and blends.