Four speeds optional: select the speed according to the type of axis to make the measurement more accurate, type 1: 2 percent to 40 percent type 2: 2 percent to 50 percent type 3: 2 percent to 60 percent type 4: 2 percent -70 percent . Probe protective cover: made of natural rubber, not easy to fall off, easy to use. High sensitivity probe: designed with 2 high-precision 303 stainless steel probes, it can penetrate the test surface and has fast and accurate characteristics. The hold button freezes the reading and holds the data. High-definition backlight display: Support backlight display, it is easier to read the measured value in the dark environment of day and night, and the work efficiency is higher. The tester is lightweight and easy to carry. Wide range of applications: can be used for building materials, wood, water stains on walls, capers or dirt, etc. . It is an indispensable device to facilitate your work. Temperature compensation function: It has automatic temperature compensation function, which can reduce the error caused by too high or too high temperature. bass during measurement.