Does it drive you crazy when things that are supposed to be level are not?  Nice artwork on the wall does not look quite as nice when it is a half-inch out of level.  Do you have your spouse stand back and say, “Move it down on the right a bit”?   I have a secret tip.  Use a crossline laser level to hang your artwork.  You can easily make every photo in the room spot-right in seconds.  These tools also help with planning on deciding, “What am I going to hang there?”

laser to level photosUse a laser level to hang photo

Use a laser level to hang photoUse a laser level to hang photo

Best of all, laser levels are inexpensive.  You can buy a homeowner’s model for $40-$60 which will work just fine.  See: https://www.amazon.com/Suaoki-Self-Leveling-Cross-Batteries-Included/dp/B01MYABSZR/ref=sr_1_2?s=hi&ie=UTF8&qid=1501540980&sr=1-2-spons&keywords=laser+level&psc=1

Suaoki-Self-Leveling-CrossSuaoki-Self-Leveling-Cross

Or, if you would like a high-end model like the “Old World Craftsmen” use, take a look at this:

https://www.amazon.com/Laser-PLS-60521-PLS180-Tool-Yellow/dp/B000QSGRTY/ref=sr_1_1?s=hi&ie=UTF8&qid=1501540980&sr=1-1-spons&keywords=laser+level&psc=1

Laser-PLS-60521-PLS180-Tool-YellowLaser-PLS-60521-PLS180-Tool-Yellow