80-20012 - Detector National Geographic - Free user manual and instructions
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| Product Type | Metal Detector |
| Brand | National Geographic |
| Model | 80-20012 |
| Dimensions (L x W x H) | Approx. 30 x 10 x 5 in (76 x 25 x 13 cm) |
| Weight | 2.5 lbs (1.1 kg) |
| Power Supply | 2 x 9V batteries (not included) |
| Detection Depth | Up to 6 in (15 cm) for small coins, 24 in (60 cm) for larger objects |
| Operating Frequency | 6.6 kHz |
| Search Modes | All Metal, Disc, Pinpoint |
| Sensitivity Control | Adjustable, 0-10 scale |
| Ground Balance | Manual preset |
| Audio Output | Built-in speaker with headphone jack (3.5mm) |
| Display | Target ID and depth indicator |
| Shaft Material | Adjustable metal with foam grip |
| Search Coil | Round, 8 in (20 cm) waterproof coil |
| Water Resistance | Coil is waterproof; control box not submersible |
| Armrest | Padded, adjustable |
| Warranty | Limited lifetime warranty (see manual) |
| Included Accessories | Carrying bag, user manual |
| Recommended for | Beginners and hobbyists |
Frequently Asked Questions - 80-20012 National Geographic
How do I install batteries in the National Geographic 80-20012 detector?
Open the battery compartment on the control box. Insert two 9V batteries (not included) following the polarity markings. Close the compartment securely.
What is the best way to ground balance the detector?
Turn the detector on and hold the coil a few inches above the ground. Adjust the ground balance knob until the audio tone is steady with minimal chatter. This compensates for mineralized soil.
How can I reduce false signals from iron?
Use the Disc mode to discriminate against iron. Turn the discrimination dial clockwise to reject iron while still detecting other metals. Start low and increase until false signals stop.
What does the target ID scale indicate?
The target ID scale on the display gives a numeric value representing the conductivity of the detected object. Higher numbers (e.g., 80-99) indicate high-conductivity metals like silver or copper, while lower numbers (e.g., 10-30) suggest iron or foil.
Can I use headphones with this detector?
Yes, plug any standard 3.5mm headphones into the audio jack on the control box. This helps in noisy environments and preserves battery life.
How deep can the National Geographic 80-20012 detect?
Detection depth varies by target size and soil conditions. Typically, a coin-sized object is detected up to 6 inches (15 cm), while larger objects like a soda can may be found up to 24 inches (60 cm).
Is the search coil waterproof?
Yes, the 8-inch round coil is waterproof, allowing you to search in shallow water or rain. However, the control box must be kept dry and not submerged.
How do I pinpoint a target after detection?
Switch to Pinpoint mode and move the coil slowly over the target area. The audio tone will peak at the center of the object. Use the coil's center to mark the spot.
What maintenance does the detector require?
Keep the coil and control box clean with a damp cloth. Avoid harsh chemicals. Store in a dry place. Check for loose screws or damaged cables regularly. The coil cable should be wrapped loosely around the shaft.
Why does my detector make erratic noises even in air?
Erratic noises can be caused by interference from power lines, other electronics, or nearby metal. Reduce sensitivity, try a different location, or ensure the coil is not swinging too fast. Also check battery condition.
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USER MANUAL 80-20012 National Geographic
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Product information
Brand : National Geographic
Model : 80-20012
Category : Detector