and you're in business.  Simple, huh?  In the Hi gain setting, the locator has a full scale range of 147 milligauss with a resolution of 0.1 milligauss.  In Lo gain, the instrument has a full scale range of 1,470 milligauss and a resolution of 1 milligauss.  Like all Dunham & Morrow instruments, there are no concerns about untimely battery failure.  The built-in Low Battery indicator starts flashing to warn you when you have only 2-3 hours of normal operation remaining. Sea Pro typically lasts up to 66 hours on two 9-volt Lithium batteries.  A power switch safety lock even prevents accidental operation during storage.
• A multi-position pistol grip • Over 60 hours from two    9-volt lithium batteries • Operates up to 500' deep • Automatic sensitivity    selection • One year warranty • Soft padded carrying case

Never miss a target with both audio and visual indicators!  Sea Pro has two outputs, a highly visible backlit, 3˝ digit (0 to ± 1999) LCD display and a bone conduction headphone. The audio output tracks the meter output; with no ferrous target nearby, the output idles at 20 hertz and increases in frequency as the you approach a ferrous target.  The LCD panel meter gives an exact numeric readout with a separate polarity indicator that can be even more useful to the experienced professional.

Battery replacement is a snap!  Unscrew the battery lens housing to replace the old batteries, then clean and lubricate the lens housing before reassembly.
 

Ferrous Metal Detectors  | Magnetic Locators