Gather the material!

Material	Quantity	Dimension/ size/weight (if applicable)	Alternative (if applicable)
Powerful Magnets E.g: door/cabinet magnets, magnets extracted from toy/motors, etc	2	Any size	-
Piece of white chart paper	1	17” x 12”	A4 paper x 2
Newspaper	1	Standard size	-
Cardboard piece	1	5” x 5”	Piece of a milk carton or any other product
Clamping clip	4	15mm-32mm	-
Cotton thread	1	-	-
Small cut pieces of steel wool - cut it out of scotch Brite dishwasher (steel spiral) - use a scissor to cut the steel spiral	1	Several tiny pieces (refer to the image below)	Scotch Brite steel spiral
Strong magnets	2	Button magnet/U magnet
Optional: Single Hole Puncher

How to get metal shards?

• Cut small pieces of steel wool and pile it up.
• You can also use scotchbrite - stainless steel spiral.
  

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Let's get started!

• First, we need to mark the location(s) where our device detects the magnetic field so that it can be saved into our database.
• We use a coordinate system for this purpose. That makes it easier and systematic.
  

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STEP 1: Take the chart paper and draw a grid of lines horizontal and vertical.

Doesn't matter how many lines you draw. Just make sure they are equidistant.

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Practice!

• Label the rows with numbers starting from 'X'.
• Label the columns starting from the alphabet 'A'. (The first column is set to 'X' by default).

Now put a magnet on any box on the chart paper and try to name it.

Block name = Alphabet + Number.

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STEP 2:

• At two different points on the second paper, stick two magnets. Make sure they don't move.  
• Cover it up with the chart paper and clamp paper clips on each side so that it doesn't move.

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Making the Detector

STEP 3: Think of a holder that enables you to see any changes in the items it holds.

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Cut a piece of thread of length 10 inches, and stick it at the back of the cardboard.

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Step 4: Join the free ends of the threads together.

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Step 5: Put some metal shards/steel wire pieces at the top of the detector.

Step 6: Put the grid paper on the top of the blank paper (with magnets) and clip them from the two sides.

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Let's give it a try!

See how the magnetic-detector works. 
Hint: Go slow.

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How would you make a bigger magnet-detector to detect the magnetic field in a room?

Make a list of what items would you need and start building it.