Accurate Measurement Bubble Level Vial 36mm Pole Level Manual Measurement Round House Level Adjustable Level For Mapping Feature: Aluminum alloy hoop-type bubble Vial with holder fits any 36mm diameter rod Round aluminum alloy house level For Carbon Fiber Centering Rod GPS Mount Description: Place the bubble level where you want to measure, wait for the bubble to be still and observe the bubble position. If the bubble is on the left, the left side is too high, if the bubble is on the right, the right side is too high, and then adjust the level. Specification: Part Name:center rod level bubble Material: aluminum alloy Color: Black Bubble Color: Green SizeInner diameter 36mm Vials with holders are suitable for rods of corresponding diameters Suitable for rods with corresponding diameters Package content: 1*center rod level bubble Note: 1. The real color of the item may be slightly different from the pictures shown on the website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. _x000D_ _x000D_