A high quality benchmark dataset of chemical laboratory instruments. Overall, the CALD dataset includes 21 different types of images of chemical laboratory instruments, with no less than 200 images of each type, mainly glass instruments.CALD includes the following 21 types of chemical laboratory instruments: Type-1: alcohol lamp, Type-2: beaker, Type-3: flask, Type-4: three-neck flask, Type-5: conical flask, Type-6 Crucible, Type-7: evaporating dish, Type-8: filtering flask, Type-9: funnel, Type-10: glass rod, Type-11: measuring cylinder, Type-12: dropper, Type-13: medicine spoon, Type-14: mortar and pestle, Type-15: plastic cleaning bottle, Type-16: rubber suction ball, Type-17: dispensing funnel, Type-18: test tube, Type-19: test tube brush, Type-20: volumetric flask, Type-21: wide-mouth flask. All images of chemistry lab instruments are carefully labeled with information by chemistry students. Each image contains one or more images of chemical laboratory instruments, and the number of chemical laboratory instruments on each image is variable, usually multiple.