5Pcs Small Circular Double Sided Adhesive Bubble Spirit Levels for Work shop, Speakers, Phonograph, Tripod, Turntable, Automount Telescope, Drill, Etc. (25x10mm)

Perfect size for checking level on my drill press in close quarters.

The bubble level is accurate and large, easy to read. The adhesive is kinda weak and doesnt want to hold on after an extended period of time.

The media could not be loaded. I’m using these on my laser engraver and 3D printer to ensure that critical parts are level so the machines are most effective. It’s old, simple technology but helps with performance and efficiency. I like that they have adhesive backing that makes it easy to adhere to surfaces.

I installed on the back of my battery drill aid in drilling a hole perpendicular in flat material worked great

Incredibly useful and very affordable. We use it on our power drill to keep us “on the level”

The protective cover of the double adhesive tape must be peeled off very carefully. it may seem tempting to do it from the edge, but I damaged a little the foam and it indicated with an error. Best use the center to start opening the thin plastic cover and work slowly toward the edge. All 6 units indicated correctly the horizontal. One piece of data is missing from the description; accuracy. I placed one unit on a precision tilt stage and when you can notice the bubble has moved a bit, that is about 1 degree. When the bubble touched on the inside of the circle, that is about 2 deg. So, I'd say it can detect 1 deg. of tilt from horizontal.

One of these came with my Celestron NexStar 8SE telescope. Of course, I promptly lost it. Having 6 gives me comfort. I would find it useful in carpentry too.

The adhesive pad requires full surface contact on totally smooth surfaces. I tried to place this over a dried up tripod bubble level and it won't adhere to it.