The Ringman Smoke Blackness Meter (Digital Smoke Telescope) shrinks the standard Ringman smoke concentration map onto a piece of glass, So as to monitor the blackness of the smoke. The smoke map seen in the telescope eyepiece or captured by a digital camera will be compared to the Ringman smoke concentration map By directly comparing, the blackness level of the smoke can be determined. It makes the testing of smoke blackness fast and easy, and improves the accuracy of monitoring work Get improved. Therefore, this instrument can be widely used in the determination of smoke blackness by environmental protection departments and industrial and mining enterprises in various regions.