If you want to completely remove iCloud Keychain sync and the information stored by it on Appleâs servers, simply follow these steps, starting on any one of your iOS devices or Macs that is using iCloud Keychain: iPhone, iPad, or iPod Touch. Go to and turn off âApprove with Security Codeâ.dding a new device to sync with iCloud Keychain. After setting up iCloud Keychain on one of your devices, you can add your other iPhone, iPad, iPod Touch or even a Mac running OS X Mavericks to your iCloud Keychain to sync all the stored information across all devices. Adding an iOS Device. 1  Go to.
Stands for Pages Per Minute.. PPM is used to measure the printing speed of both inkjet and laser printers. Most printers include a PPM rating for both black and color documents. These speed measurements are typically listed in the printer's technical specifications.his is because manufacturers measure the maximum PPM in the fastest printing mode, a.k.a. economy mode, which is also the lowest quality. When printing in regular mode, the speed may be twice as slow. When printing in fine or high-quality mode, the speed will likely be reduced even further.
Reading charts are often used to measure visual acuity. Visual acuity measurements evaluate how clearly each eye is seeing. As part of the testing, you are asked to read letters on distance and near reading charts. The results of visual acuity testing are written as a fraction such as 20/40.When testing distance vision, the top number in the fraction is the standard distance at which testing is done, twenty feet. The bottom number is the smallest letter size you were able to read.A person with 20/40 visual acuity would have to get within 20 feet of a letter that should be seen at 40 feet in order to see it clearly. Normal distance visual acuity is 20/20.Preliminary testing may include evaluation of specific aspects of visual function and eye health such as depth perception, color vision, eye muscle movements, peripheral or side vision, and the way your pupils respond to light.eading charts are often used to measure visual acuity. Visual acuity measurements evaluate how clearly each eye is seeing. As part of the testing, you are asked to read letters on distance and near reading charts. The results of visual acuity testing are written as a fraction such as 20/40.