Specification: Item Type: Magnetic Field Probe Product Material: Printed Circuit Board Working Frequency: 9KHz-3GHz Package List: 5 x Magnetic Field Probe Note: Do not use over frequency. Including 5 pieces probes, and each probe has its own size to meet your various detecting needs. The working frequency is from 9KHz to 3GHz, and the wide range ensures more sensitive detecting. With small size and light weight, the carrying and storage of the probes are more convenient. Made of high quality printed circuit board, all the probes are very durable for long-term use. The whole process of spraying tin to ensure good passing performance of large and small currents. Including 5 pieces probes, and each probe has its own size to meet your various detecting needs. The working frequency is from 9KHz to 3GHz, and the wide range ensures more sensitive detecting. With small size and light weight, the carrying and storage of the probes are more convenient. Made of high quality printed circuit board, all the probes are very durable for long-term use. The whole process of spraying tin to ensure good passing performance of large and small currents.