Your bench isn't the limit here, the rope is. The detector is a cheap Level 1 blueprint, but no bench in the game crafts rope. The calculator can unfold it into cloth; read that as its value, because both coils come out of barrels, crates and recycled gear, and a fishing rod or a crossbow wants the same pair.
The rest is one furnace run: a little high quality metal and a pile of metal fragments. Rope is the line to stockpile, so every coil from a road run goes into one box.
Don't recycle a detector you're bored of to get the rope back. The recycler returns only one of the two, so park it in a box for the next quiet evening.
Questions
Metal Detector ×10: how many resources?
High Quality Metal ×50, Metal Fragments ×2,000, Rope ×20.
Which workbench does Metal Detector need?
Workbench level 1.
How long does Metal Detector take to craft?
15 s for one, every step included.
How much scrap does researching Metal Detector take?
