3 ms·

At night it is more than sufficient. I even use it as a flashlight

• mrweasel 1mo ago
  It has to be extremely dark though, or maybe mine has a worse than normal backlight. Other models are much better, it's just the F-91W. The fact that Casio is well aware that the backlight is just terrible, but haven't fixed it in close to 40 years is hilarious and just makes me love it even more.
  • nielsole 1mo ago
    Oh yeah I have good blinds and live in an area with medium light pollution.
  • LtWorf 1mo ago
    If you have so much ambient light… just look at the clock and read the numbers.
• greysonp 1mo ago
  And you specifically have an F91W? In pitch black, it maybe illuminates 2/3 of the screen for me. I can't imagine using it as a flashlight! But mine is newer, maybe the older ones have better lights.
  • nielsole 1mo ago
    Yes, F-91W still on its first battery. It's not a great flashlight, but it allows me to find back into bed and not run into anything