Discovery 2 Metal Detector (630-3004) Troubleshooting Faxback Doc. # 32189 Q: The metal detector works fine at home. However, it constantly beeps at the beach close to salt water. A: Salt water contains salt which is Sodium Chloride. The Chloride ion binds better and thus may form Zinc Chloride, etc. and the unit is picking up the sensitivity of these trace metals. Adjust the sensitivity. (IR-04/22/96)