SV-5Y Opacimeter has a large LCD display screen with whole Chinese menu. Separate design made the control unit apart from the test unit. By the use of “air curtain” technique, optical system can work in the circumstances without smoke pollution. Stable temperature of test unit can avoid the water condensing. SV-5Y can test the temperature of the petrol and the speed of engine, and has the function of test speed up and instant test. The equipment can handle and display the test result automatically, and it can be connected with computer through RS-232 plug, and there is a mini printer inside.