Contrast ratio results for HP Pavilion 15

Contrast ratio 266:1
Monitor model HP Pavilion 15
Submitted 11 Feb 2018 16:13 CET, by 175.158.*.*
Camera model Canon EOS Kiss X3
Processing remarks

Warning: image file 1: camera was zoomed in too much.
image file 1: Warning: image includes screen edges or something that's not a monitor. Hold the camera close to the screen.
Warning: image file 1: Overexposed. Please decrease the shutter time.
Warning: image file 2: camera was zoomed in too much.
image file 2: Note: image seems to be noisy. Try reducing the ISO setting or increasing the exposure time.

Black
Screen photo
Luminance 0.05 cd/m2
Luminance spread 0.12 cd/m2 (2 standard deviations)
Exposure value –2.14 stops   (aim for –2 to –3)
Exposure spread 4.25 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 12.3   ISO: 100   F-number: 1.8
Focal length: 79.4 mm   (35 mm equivalent)
Exposure compensation: 0
White
Screen photo
Luminance 14 cd/m2
Luminance spread 16 cd/m2 (2 standard deviations)
Exposure value –2.35 stops   (aim for –2 to –3)
Exposure spread 2.02 stops
Area used for calculation 1 x 1
Camera settings Exposure time: 1/25   ISO: 100   F-number: 1.8
Focal length: 79.4 mm   (35 mm equivalent)
Exposure compensation: 0

The luminance values in cd/m2 are not very reliable, since camera sensitivities can easily differ up to 50% from their nominal value. Typically, the real luminance is 30% lower than this number. The area used for calculation is chosen such that it corresponds to a viewing angle of ±14° horizontally and ±10.5° vertically, which is equivalent to viewing the screen from a distance of about 1.5 times the diagonal size.

Unfortunately, there is a lot of variation in how cameras use EXIF settings. If photos from your camera your produce unusable results, try coming back in a few days. I review submitted pictures regularly and try to fix problems.