4.The edge of the circular magnet has the strongest magnetism because its magnetic field distribution is similar to that of the bar magnet. The magnetic lines of force point from the N pole to the S pole, and the magnetic field is strongest at the edge of face. 1.This product uses KTH5641A1 as a sensor. KTHA5641 outputs 0-2.5V when encountering the North Pole and 2.5-5V when encountering the Pole, with a step of 1.5mV/GS. 2.The analog quantity is transmitted to the 51 single-chip microcomputer via the 18-bit AD chip MCP341 to calculate the magnetic field strength. 3.The magnetic field at both ends of the bar magnet is the strongest, and the magnetic field in the middle is the weakest. This is because the bar magnet can be considered to be composed of many tiny magnetic needles arranged in the same direction. The magnetic lines of force at both ends of the magnet do not completely cancel each other, but the magnetic lines of force in the middle cancel each other, resulting in stronger magnetism at both ends. 5.Application: Magnetic force measurement, Manufacturer: Ounfhtrttk