Another thing that you may want to consider when you shop for metal detectors online is the frequency range. All baggage, brief cases, purses, back-packs, sacks, baby carriers, patient gifts, etc., will be inspected for weapons by the assistant at the metal detection post.
Alternatively, if you’re looking to cover large, open areas like beaches and farm fields, a larger coil might be a better option. The only real advantage it has over the DD (in my opinion) is that it can be easier to pinpoint your target.
It’s a pricey piece of kit, but you won’t find better for coin hunting. Superfast re-tune speed on a budget machine is almost unheard of, but Fisher’s cheaper model is rapid on the return. Another great option as one of the best rated metal detectors is the Fisher F22 with regard to value for money.
The waterproof 6″ round Double-D coil is very sensitive to small targets, and perfect for finding treasure in high trash areas. Minelab 11″ round DD Smart Coil for the Minelab CTX 3030. Maximize your treasure hunting at an affordable price with the TREASUREpro.
This allows you to search one area on several frequencies at the same time, increasing your chance of a find but filtering out the trash. The coil is submersible but the body isn’t, so don’t drop the Ace 300 in water – this is where some of the cost is shaved off. The ACE 400 has a waterproof 8.5×11 DD PROformance search coil and weighs only 2.9 pounds.
Great wet sand machine, Lightweight, 40 hours battery life, very easy to use. The frequency has been boosted to 18.5KHz for much improved sensitivity on small targets in the trashiest sites.
If cassiterite is not conductive ( you can test it with an ohmmeter) then an EM based machine cannot detect it. I think it will be fun to play with a detector and I believe that there is real chance of finding something interesting. If I decide to buy a detector I will post my observations also in this thread. There is a Garret AT PRO/GOLD version that costs about 600 euros and a cheaper one called ACE 250 (260 euros) that are said to have good price/quality.
In the past frequency was a big thing, but more modern machines have pretty much-overcome frequency worries with good design and better circuitry. That’s why gold detectors generally have a higher kHz capacity than lower priced all-purpose a knockout post models. The higher your kHz the more likely you are to find gold. The machine does the hard work, adjusting itself as you move around. Well, if you’re a pick-it-up-and-go type, knock yourself out with automatic ground balancing.