1.Springs: good workmanship and creative appearance ensure its popularity and practicality in anywhere like classroom, laboratory to use,spring scale for experiment 2.Teaching tools: long times measurement, dual scale, highprecision reading table, to ensure accurate reading,dual scale spring scale 3.Hanging tube spring scale: each scale has at the top for easy hanging and a hook at the bottom to fix the item to be weighed,experiment tool 4.ton hanging spring scale: sturdy stainless steel spring and hook, very strong and , to deform or break,scientific spring scales Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store