Overall size ：200*145*110mm
Product Weight：0.7kg
selectable air core solenoid
this features a liquid filled compass and runs over 25 hours on one battery .Multi turn coil,which changes the voltage from 5MV to 1.5V,
offers precision resistance .100/200/400 turn selectable air core solenoids change the magnetic field 4 times one AA battary included.
