Testing Bubble Level Vial Accuracy

IMPORTANT: make sure that the working edges of the level and the surface you are using are completely free of any foreign material or debris.

Testing Bubble Level Accuracy For Level Vials:

1. Place the level on a flat horizontal surface
2. Note the position of the bubble and mark the position of the level on the surface
3. Reverse the level, end for end, making sure the leveling surface is down. Place it in exactly the same position as marked in Step 2.
4. If bubble rests in the same position as noted in Step 2 the level is true. 

Testing Accuracy For Plumb Vials:

1. Place the working edge of the level on a flat vertical surface
2. Note the position of the bubble and mark the position of the level on the surface
3. Reverse the level, working edge for working edge and place in exactly the same position as marked in Step 2.
4. If bubble rests in the same position as noted in Step 2 the level is true.  

Johnson's bubble levels will hold true unless the actual frame is bent, twisted or otherwise damaged. Once this happens the spirit level is usually un-repairable.

We do NOT offer any repair service for our spirit levels. Almost all our bubble level models DO feature easily replaceable vial and vial cover assemblies which we will be happy to send free of charge.