Sensors measuring a magnetic field and relevant products, namely, position sensor, velocity sensor, acceleration sensor, and temperature sensor; liquid level sensor; rotary position sensors, namely, rotary encoders, contactless potentiometers; valve position sensors; knob position sensors; gear tooth motion sensors in the applications of speed, and direction sensing, linear and rotary speed sensing, linear and rotary position sensing, linear magnetic scales, magnetic encoders; switch sensors for sensing a magnetic field, and for use with utility meters, namely, water, gas, heat meters, and for use with acoustic devices, a hearing aid, proximity switches, speed sensing, rotary and linear position sensing, and solid state switches; linear sensors for use with magnetic field sensing, current sensors, industrial flow meters, displacement sensing, and rotary position sensors, and magnetometers with use for geomagnetic sensing, and displacement and position sensors; sensors for measuring concentrations of chemicals and bioagents; computer hardware incorporated with a magnetic sensor for tracking people, objects and pets; magnetic imaging sensors, counterfeit coin detectors, banknote counters and validators, banknote sorters, automated teller machine, ATM, Automated vending machine; magnetic card readers; counter/meters, namely, coin counters, currency counters; global position system or satellite navigating instruments, namely, GPS, e-compass, geomagnetic sensors; bar code readers, cash registers; magnets; magnetic encoders; electric theft prevention alarm; precision measuring gauges using a magnetic sensor; electro-dynamic apparatus for the remote control of vehicles, motors, appliances, electric switches, thermometers, valves, assembly lines, gears, lighting; electric relays; electric limiters; electric distance measuring gauges using a magnetic sensor; electric switches; a magnetic sensor for electric commutation; electric monitors using a magnetic sensor; automatic regulator using a magnetic sensor; electric remote controls for the industrial operations; ammeters; potentiometers; electric door openers; battery chargers; electric locks; electroplating parameter testers; current regulator; remote controls using a magnetic sensor for motors, appliances, electric switches, thermometers, valves and lightings; electronic bulletin boards; micrometer gauges; precision balances; electric measuring gauges using a magnetic sensor