Accurate: 0.1N (10gm) Scale resolution, measures in and grams. Zero(ing) adjustment built into unit. Specifications: Maximum measurement is 500g (5N). Package includes 10 Pack spring scale. Clear Scale: The transparent tube is made of strong acrylic material, you can see inside clearly. Easy to Operate: The mounting ring is attached to the top, hook is attached to the bottom, convenient to carry. Wide Application: For gravity measurement and tension measurement. Great for teaching experiment and laboratory equipment. Colour:Blue Material:plastic+metal Package Contents: 10 x Spring Scale Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.