Purpose SYR71 Steel-bar Location and Corrosion Tester, incorporating functions such as test steel-bar diameter, distribution, concrete backing thickness, and corrosion in concrete. Specification 1. Multifunction instrument. Its function includes steel-bar diameter, distribution, concrete backing thickness, and corrosion test. 2. Grid and section scan mode. Instrument can display steel-bar distribution and scan steel-bar without concrete size limited. 3. Automatic measure environmental temperature. Instrument design to contain a measure environmental temperature module, it can measure, record, display environmental temperature quickly no thermometers required. 4. Can save test date. This is convenient for laborer data management 5. Real USB transmission. Data can be transmitted to computer for future process and analysis. 6. Powerful data process and analysis software in windows. Software can display analysis result by spectrum and isoline. Test data can be export to word or Excel easily.