Smoke Density Apparatus is used for measuring & observing the relative amount (Density) of smoke produced by the burning (combustion) or decomposition of Plastic, Cables etc. under controlled and standardized conditions. The sample is burned under controlled pressure of LPG, through a specified burner as per the standard. A light source and a photo receptor is placed on either side of the chamber, and the percentage of light absorbed is displayed through a linear amplifier digital electronic photometer with 0 to 100% absorbance scale. The apparatus comes complete with timer with 1.5-second pulse at every 15 sec with hold facility, gas pressure gauge, and damper and exhaust fan for removing smoke from the chamber. The instrument as per the ASTM specification and also confirms various other international standards. The instrument comprising of. Timer. (4 min/15 sec beep sound). Damper. Exhaust fan Specimen Holder. Burner, gas regulator. A glass door chamber. Electronic Photometric System.