Please kindly noted that this item is sold by from Joybuy marketplace. 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: 14.00X7.00X3.00cm/5.50X2.75X1.18in This product is manufactured with material, special;and unique for long time use Ticker-tape Timer, Electromagnetic Dotting Timer, Laboratory Equipment, Physics Acceleration Apparatus, Teaching Equipment The ticker-tape timer is a perfect teaching equipment for laboratory or electrical experiment 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