[3 in 1 Tool] This compact device combines a depth gauge, sliding marking ruler, and level, can be used for depth measurement, leveling, contouring, and accurate point marking. [Fast Locking] The marking ruler features an ergonomic knob for easy adjustment of ruler position, which can firmly lock the ruler in place to prevent any unnecessary sliding, ensuring stable and accurate layout lines on wood or gypsum board. [Sturdy Material] The marking level ruler is made with sturdy aluminum alloy block and rust proof stainless steel ruler, ensuring long lasting durability, making it a reliable companion for contractors and workshops. [High Visibility Bubble] The scribing ruler is equipped with clear and transparent 90° and 180° level bubbles (with an accuracy of 0.5mm/m), which can perform real time and accurate level measurements. [Magnetic Base] The magnetic base can firmly adhere to metal surfaces, making it suitable for electricians and scaffolding operations, ensuring easy and accurate readings., Manufacturer: Jelquix