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1.7 SENSITIVITY ADJUSTMENT
If the control marked ‘audio’ is rotated slowly clockwise (with the search head well clear of any metal), a
point is reached when the sound produced is a steady ticking, and the meter is displaying zero (0). Further
clockwise rotation will cause the meter to deflect to the right, and the sound to increase in frequency through
a buzz to a whine. Maximum sensitivity is achieved when the sound is set to a low tick-over, and is
appropriate when searching for deeply-embedded metal. More often however, this setting gives more
sensitivity than is necessary or desirable, and the control can and should then be turned back as required.
2 USING THE INSTRUMENT
Before you start, adjust the sensitivity (see above).
1. Hold the search head as close as possible to the wood.
2. Move the search head across the search area.
When the search head is approaching a metallic object:
• The control unit will start to emit a sound which will increase in pitch as the search head moves
closer to the object.
• The needle on the meter will move towards the right.
The centre of the search head is directly over the metallic object when:
• The pitch of the sound is at its highest.
• The movement of the needle on the meter is at its maximum.
If a very strong signal is received, it is advisable to reduce sensitivity by turning back the control knob
(anticlockwise), or by holding the search head away from the wood.
