Fisher Gold Bug Pro vs Garrett AT Gold: Nearly the Same Frequency

Both, and that is the most useful thing to understand before spending. At 18 and 19 kHz they sit above general coin machines and well below dedicated nugget detectors such as the 45 and 48 kHz machines. That middle band is genuinely good at two jobs: small gold that a coin machine misses, and relic hunting in mineralised soil where a low-frequency machine becomes unstable.

What they are not is specialist nugget hunters. If you are working known goldfields for the smallest gold, a higher-frequency machine will out-sensitise both of these, and the Gold Monster against the Goldmaster 24k covers that end. If you are hunting old homesteads and battle-adjacent farm fields in red mineralised dirt, these two are exactly right, which is why so many relic hunters own one. The relic roundup makes the same point.

Two makers with similar disclosure habits here, which makes this a cleaner comparison than most gold pairings.

Nine rows. One of them is submersion, and that is the row people are really paying for.

You hunt dry ground and want the most capability per pound spent. The live mineralisation readout is the underrated feature here: it tells you how hard your soil is working against you, which is information that changes how you set the machine and where you spend your afternoon. Very few detectors at any price show you that continuously.

Choose it too if you like to adjust. Independent threshold and gain control is the combination experienced prospectors ask for, because threshold sets what you hear at the edge of detection and gain sets how hard the machine drives, and being able to move them separately is how you work a noisy patch. At 2.5 pounds it is also light. The Gold Bug Pro settings chart is the operating reference.

You work creeks, wet washes or shorelines. Submersion to 10 feet is the one thing the Gold Bug Pro does not publish, and in gold country a great deal of productive ground is in and around water. If you are dropping a coil into a creek bed regularly, that rating alone settles the argument and the price difference is justified.

Choose it too if you want one machine that also handles relics well in iron. Iron audio and a true all metal mode make the AT Gold a capable old-site detector, and the AT platform has coils behind it, including Garrett 5 by 8 DD PROformance Coil for tight ground and Mars Sniper 10 by 6 DD Coil as an aftermarket option. The AT Gold settings by site type page and its target ID chart cover the machine in use.

It shortens depth and it adds noise. Iron mineralisation in soil returns its own signal, and the machine has to subtract that before it can hear a target, which costs sensitivity. This is why ground balancing exists, why both machines publish a ground balancing system, and why published depth figures from any maker mean very little in red dirt.

The practical consequence is that depth on either machine is a range tied to target size, coil and soil rather than a number. The expected detection depth calculator takes mineralisation as an input for exactly that reason, and how to ground balance is the skill that recovers most of what mineralisation takes. Neither machine does that thinking for you the way an automatic prospecting detector would.