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Review title: It works as advertised
Product review: I have purchased both units separately. The small unit can pickup heads of nail etc in walls but it is not sensitive enough to check for metal in wood before planing. The large red unit is great - it has an ear piece so you can hear sound as it senses metal while you in a noisy shop or other area as well as a vibrating mode or both.I did one sensitivity test. I drove 1/2" 18guage finish nail from my air gun into a 3/4" block of wood recessing it a fraction of an inch below the surface. The big unit picked up the brad on both sides of the wood. The little unit couldn't find it. I believe it's because their isn't enough mass in the tiny nail. If you like to recycle lumber or repair old furniture then the red unit will save your planer and saw blades which = frustration and money. It's great for finding hidden nails in repaired furniture
