| AUDIO OUTPUT | 
            Signal increases or decreases in frequency with signal strength (gradient field intensity). Audio frequency range - 30 to 4000 Hz. | 
        
        
            | VISUAL OUTPUT* | 
            Visual: Expanding bar-graphs indicate polarity (positive or negative) and signal strength. Digital readout shows gradient field intensity expressed in milligauss (mG). Range – 0 to 500 mG | 
        
        
            | BATTERY INDICATOR | 
            4-segment LCD | 
        
        
            | GAIN | 
            4-Level LCD - Low (L), Medium (M), High (H), Extra High (XH) | 
        
        
            | VOLUME | 
            3 Levels, Muted, Medium and Maximum | 
        
        
            | INPUT POWER | 
            Supplied by one 9V lithium battery (lithium recommended, but not required) | 
        
        
            | BATTERY LIFE | 
            24 Hours (intermittent usage) | 
        
        
            | OPERATING TEMP | 
            -13° F to 140° F (-25° C to 60° C) | 
        
        
            | OVERALL LENGTH | 
            Open – 26” (66 cm) 
            Closed – 15.5” (39 cm) | 
        
        
            | WATER RESISTANT LENGTH | 
            11.5” (29 cm), only when operated in open position | 
        
        
            | NOMINAL SENSOR SPACING | 
            9.5” (24 cm) | 
        
        
            | WEIGHT | 
            Approximately 2.4 lb (1.1 kg) | 
        
        
            | CONSTRUCTION MATERIAL | 
            High impact ABS |