Ximimark2Pcs Metal Detector Kit Electronic Soldering Practice Kit Non-Contact Sensor Board Module Electronic Part Metal Detector DIY DC 3V-5V 60mm

Very useful metal detector to start making a big one. Good and affordable price!

0/8 purchased kits had the one required S9018 NPN transistor + two S9012 PNP transistors. Most kits had two transistors only usually NPNs. In addition 8/8 kits included one 4.7K ohm resistor (not required), but were all missing the one (required) 470 Ohm resistor. No instructions, no part orientation warnings for polarized capacitor, polarized LED, and polarized switch none of which (of course) are keyed. You must carefully place parts by (1) silkscreen hints (like silkscreen notch on switch), ground plane that connects to polarized capacitor (-), and LED anode must be identified from LED datasheet (not included). Does not include case, battery holder, mounting hardware or handles required for actual use. Purchased as gifts, but probably not worth the money when all issues are considered. CAVEAT EMPTOR indeed! No schematic diagram or explanation of circuit theory (a lost opportunity to inspire our overly video game addicted society; a shame really as this kind of kit is exactly what got me interested in Electrical Engineering many years ago. I do not yet know if it actually works, with 8 kits and not enough parts of the right kind to finish even one. I saw no way to simply get the parts I am missing from the vendor; sending the kits back is not worth the postage. AVOID.

Fun project to kill an hour or two. Yes, the sensitivity is <60mm! More like 10mm. Wish the assembly instructions were included with the parts. The 470 ohm resistor was delivered as a 4.7k ohm. Don't know why an extra 10uF capacitor was included. Works with a 2032 button battery.

Assembly took about 1 hour , with 1 resistor missing from kit, that I supplied myself. As there are no instructions care must be taken over the 2 different types of transisitors and the polarized components such as transistors, LED & electrolytics.The metal detector worked immediately and well, so for the price this is a good product but not something most kids could assemble correctly without assistance.

i built an automated robot with mapping abilities and programmed it to use metal detectors and search an area for items made of metal. they have proven very reliable

Great product, Great Price, but missing parts, one of three transistors, and paper polarity stickers on labels fell off in package

Kit is missing a 9012 transistor leaving one of the item useless.

My kids had a lot of fun assembling these metal detectors, but they don't really work.At best, there is a constant squeal and it changes pitch when it detects metal.YouTube videos confirm how they work. Worth the $5 but clearly not a usable metal detector.