Service Instructions

Our lifetime warranty covers defects in material and workmanship for as long as it is owned by the original purchaser. The warranty excludes batteries, damage caused by leaky batteries, cable breakage due to flexing, wear of the searchcoil housing, and leakage cause by the condition of water seals on underwater detectors. Also excluded are instruments which have been abused, altered, or repaired by an unauthorized party.

If you need to send your detector to the factory for repair, please follow these shipping instructions:

  1. Be sure to send, at a minimum, both the coil with its cable and the electronics control housing. Unnecessary items, such as extra poles, need not be shipped. However, the new Cortés, DeLeón, and Tejón (and some very early models) require that the control housing remain attached to the upper pole/armrest assembly.
  2. Include a note to the repair department describing the problems you are experiencing and under what circumstances. Details such as what mode, what setting, conditions, etc., are always helpful to the technicians, especially if the problem is of an intermittent nature.
  3. Include your physical address (No P.O. Boxes), as we will return the unit to you by UPS (contiguous states only; HI, AK and Canada will be shipped via the US Post Office). Tesoro pays for the return shipment if within the US and Canada. If you are located outside the US and Canada, we will ship via Global Express Mail, and you will be responsible for shipping costs, customs and/or duties.


Include a daytime phone number in case our technician needs to speak with you.

Send to:
Tesoro Electronics, Inc.
ATTN: Service Dept.
715 White Spar Road
Prescott, AZ 86303
If for any reason there are non-warranty charges, we will contact you before proceeding with the repairs.

NorthCoast Metal Detectors

Ph: (250) 635-5676


TesoroThe Name That Means TREASURE

Quality Built Metal Detectors Backed With A Lifetime Warranty


24K gold is pure gold.


18K gold contains 18 parts gold and 6 parts of another metal(s), making it 75% gold.

14K gold contains 14 parts gold and 10 parts of another metal(s), making it 58.3% gold.

12K gold contains 12 parts gold and 12 parts of another metal(s), making it 50% gold

10K gold contains 10 parts gold and 14 parts another metal(s), making it 41.7% gold.

10K gold is the minimum karat designation that can still be called gold in the US.