Professional Level 20-Inch Aluminum Alloy Magnetic Torpedo Level, 3 Different Bubbles/45/90/180Measuring, Shock Resistant Spirit Level

? Features: 1. Epoxy coating, durable 2. Easy to clean high-strength magnetism, easy to measure steel objects 3. Strong professionalism and accurate precision ? Specifications: Product Name: Level Material: Aluminum alloy + ABS Length: 30cm/40cm/50cm Thickness: 2.5cm Width: 6.0mm Error: 0.1% Number of blisters: 3 package: 1* level 1*Instruction ? [How to use]: There is a floating bubble in the middle of the glass tube. Place the level ruler on the object to be measured. The side of the level ruler bubble is higher, which means that the side is higher, that is, you need to lower the height of the side or increase the height of the opposite side. Adjust the bubble to the center, it means the measured object is horizontal in that direction.helves, cabinets, tiles and photo frames. All jobs that require straight lines or precise measurements.