Bon Tool Smart Tool Inclinometer (21-121),Matte black

I do accessibility surveys for ADA compliance. The Smart tool is the tool of choice for this work. It is accurae, does what I need it to do and is small enought to carry in luggage. All good. The thing that makes it different from competing brands is the ability to re-calibrate to factory standards on site. Very important when work must be legally defensible. That is difference in price

I purchased this level module for my significant other who is visually impaired. With a 10X magnifying glass he was able to tell the bubble was close to the middle with a standard bubble level, but was far from accurate. It appears that the company has change the design of this level since some of these reviews have been written. There is no apparent way to attach it to anything. If you're looking for a torpedo level, this would be it. If you need a longer level, you could probably tape it to the top of another level or buy a longer one. It appears to be a quality, well-built level with many features and it is easy to use. The sound feature is loud and clear and works well for the visually impaired or anyone who has the need to level something without watching it. We would recommend this to anyone. Thanks again Amazon for coming through.

This product is good for those who want to set circles manually with altitude. (You have to a computer/palm with up-to-the minute altitude/azmimuth data to do this.)In my testing when mounted to my dobsonian telescope, the angle of the object is dead-on in a 0.8-degree FOV eyepiece! (+/- 0.1 degree error!!!)Since it's water-resistant and can handle lower temperatures, this can handle observing in tough environments.This is a wonderful product not only for home-improvement products, but astronomy!Mark

No magnetic base

For the most part one doesn't really need 0.1 of a degreee accuracy but personally I love that I can have it. Guess I'm one of those type A types...oh well. This thing is super accurate and has some great features. Now I should tell you M-D is no longer producing the levels for this module to go in (told to me by a distributor who said he's tried everything to get them to start producing them again because of the amount of orders he gets for them) He has only a few non-magnetic M-D made levels left in stock so if you want the levels these go in, better search hard and get them while you can. That said, I do not know if this module will fit in levels made by other manufacturers.

I purchased this digital level specifically because it can be calibrated and that it is compact for travel. A lot of digital levels available can only be zeroed which is *not* the same as calibrating it. Zeroing it has the display set to 0 so you can measure the change in degrees from the starting point. Calibrating it has the display read the same value whether the level is set in one position or spun around 180 degrees to the opposite position. We have a few digital levels at my work that has only the zero function and not a calibration function. I never use those levels as they are inaccurate and when placed on a surface known to be exactly level (0 degrees), they're 0.2 to 0.3 degrees off. We also have two of the M-D Tools 24" levels which use the same module as this one and they're the only levels I use.

The compact design makes this is very good for use on stair treads and other small areas. We have also used this in the percentage mode to insure compliance with ADA regulations. It has held up well in field conditions. Well worth getting.

It is accurate. That works for me.