FG-4 is a 3-axis OEM fluxgate sensor that comes in small size and lightweight package that also makes it robust and waterproof.
 
Specification:
– 0.1 nT sensitivity per each axis
– ±70 microtesla range ( ±0.7 oersted )
– 5V supply
– frequency output
– waterproof
– weights only 70g 
 
Dimensions:  3.7cm x 3.87cm x 3.7cm