Citmage Desk Book Stand Document Holder Heavy Duty Metal Reading Stand with Book Magazine Menu iPad Music Score Speech Draft with 5 Adjustable Positions(Black) Black auspowers_batchone 4 Ounces Capacity Fit Daily

4 Ounces Capacity Fit Daily Use: With its 4 inches height and holds about 4 ounces

Automatic fills when below water level

Arduino UNO board

Please Do Not Use It for Purposes Other Than Air

and for demonstrating polar attraction and repulsion

Citmage Desk Book Stand Document Holder Heavy Duty Metal Reading Stand with Book Magazine Menu iPad Music Score Speech Draft with 5 Adjustable Positions(Black) Black auspowers_batchone 4 Ounces Capacity Fit DailyCitmage Desk Book Stand Document Holder Heavy Duty Metal Reading Stand with Book Magazine Menu iPad Music Score Speech Draft with 5 Adjustable Positions(Black) Package Include: 1 x Desk Book Stand Color: Black Size: 8. 3x6. 5x10. 2. Weight: 1. 03 lb Feature Quick folding for easy storage. Can be stored in anywhere. It is made of high grade stainless iron and steel, environmental protection paint material. Suitable for everyone. Eliminate the fatigue