Specifications:
a) Deflection magnetometer
Length: 40 cm on either sides
from centre
Material: Acrylic
Track for bar magnet: Yes,
12.5 mm width
b) Compass
Size: 100 mm diameter
Mirror for reduced parallax error
Graduation: 1°
c) Bar magnet pair
Length: 50 mm each
width: 12 mm
Material: AlNiCo