Profile: Beijing Time High Technology Ltd. manufactures and markets testing instruments. Our products include portable hardness testers, ultrasonic thickness gauge, bench hardness testers, coating thickness gauge, roughness testers, ultrasonic flaw detector, vibration tester, infrared thermometer and concrete testing gauge. We are engaged in the design and manufacture of portable hardness tester. Our HLN-11A tester has a wide measuring range for all metallic materials. It has a direct display of hardness scales such as HRB, HRC, HV, HB, HS, and HL. Our TC 100 concrete testing gauge is used to detect the thickness of concrete covering layer and rebar diameter. It also detects the location of magnetic substance and electric conductor in non-magnetic & non-conductive medium such as cable inside wall body & water & heating pipe. This instrument is a kind of intelligent nondestructive test equipment possessing the functions of automatic detection, data memory, and output. It helps in measuring the thickness of concrete over steel reinforcement and metal pipes, rebar location & diameter. Our TC 200 depth gauge is used to measure concrete crack depth by applying the principle of acoustic diffraction. It is also used to measure propagation velocity of ultrasonic wave in concrete.