I'm sharing a handy trick that I have used for years, even before I had a smartphone. Whenever I would go shopping I always want to make sure that I'm getting the right size or style of what I need. Take for example the bulbs in the photo, they are used in my two tart warmers that I have in my house. Last time I went shopping for one, there were so many to choose from that I ended up not buying one because I wasn't sure which one I needed. When I got home I placed a towel on the counter (so the bulbs wouldn't roll off), then added a tape measure and placed my bulbs next to it. I also jotted down the wattage because it was close to impossible to read from the bulbs. I had to use a magnifying glass. I then took a picture, as you can see, and I keep it stored on my cellphone. I even went one step further and added it to my Evernote files so if my phone were to die and I lost my photos, I'd still have access to that picture. You can also use your online photo albums, google drive, your cloud backup, there are hundreds of options.
Even if you don't have a smartphone, as long as your phone has a camera, you can use this little trick. If you carry a camera in your purse, you can do this too, just don't delete these pictures.