Description This is a Electromagnetic dotting timer for measuring short time use. Manufactured with the purpose of durability, this product would spend eminently long period of time with you. Perfect to develop student's brain and rich their physical knowledge. With stable performance and excellent workmanship, you can use it conveniently.Features- Color: Black- Material: Plastic, Metal- Size: About 15.5x8.3x3cm/6.09x3.26x0.18inch- This product is manufactured with high quality material, special and unique for long time use. - The ticker-tape timer is a perfect teaching equipment for laboratory or electrical experimet use.- Increase students' understanding of acceleration, stimulate children's interest in learning and increase their learning pleasure.- A useful and practical teaching apparatus for kids to develop student's manipulative ability, memory and exploration ability in physics.- Helps to explain relevant knowledge in class.Package Including1 x ticker-tape timer1 x carbon paper1 x paper tape1 x desk clamp