I have both large and small coil models and Homefire is right. The larger coil gives slightly better depth but there's a catch. The small coil allows better pinpointing and when used in an area of nearby metal, allows you to go closer to the uprights of a playground set, for example. The small coil is less sensitive along the edge and you can nearly touch the pipe before it sounds off.
Being hard wired into the circuit, I believe the coil is tuned to the board so changing one would be an issue. Perhaps, like me, you'll find it more economical to simply buy a second one. At under $100 second hand, they're a real bargain as well as being a champion of a detector.
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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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