•It can be used to test whether the walls, floors, ceilings and tiles of houses are empty or not
•With telescopic adjustment and stainless steel material, it is shockproof and non-slip.
•The round ball design can avoid scratches on people or the blackboard.
•The handle is made of sponge material, which is non-slip, shockproof, and feels comfortable.
•Multi-section shaft and double pressure groove design makes it flexible to use, and each section is tightly connected, which is stable.
•Anti-drop lanyard can be put on the wrist to prevent it from falling off, which is convenient to use.
•All parts are tightly connected, stable, stable without shaking, and flexible in adjustment.