
A spirit level is enough. In the second level of the bubble, the bubble won't stay where you rotate it, making it useless.

π΅ IRWIN Tools Bullseye Level (1794487) - Blue
9 Review

DigiPas DWL80PRO: Compact Digital Level & Angle Gauge - Accurate Protractor, Bevel Gauge, and Angle Finder, 0.05Β° Sensitivity, 4 inch Pocket Size
11 Review

π Kapro 905-41-24 24-Inch Level Tool - Premium Bubble Level with Shockproof End Caps, Superior Accuracy & Visibility, Optivision Red and Plumb Site Dual View Vial, Condor Spirit Level
10 Review

π 60MM High Precision Horizontal Bubble Cardan Level for Accurate Measurements
9 Review