The time or date is adjusted by pressing the lower left button three times to bring the watch to time adjustment mode. Pressing all three buttons at the same time will fill all the cells on the LCD until any button is pressed again. The right button, labeled "Alarm On-Off/24hr", is the function button: when used, it starts and stops the stopwatch, changes the settings currently being adjusted, or switches between the 12- and 24-hour modes, depending on what mode the watch is currently in.The lower left button, labelled "Mode", cycles the modes of the watch: time display, alarm, stopwatch, and time/date adjustment.The upper left button, labeled "Light", turns on the light, cancels the alarm, resets the stopwatch or marks the split (lap) time, and is used for selecting settings.The watch is controlled by three side-mounted push-buttons. The watch is currently set to sound the alarm and hourly chime Operation Casio F-91W, in regular timekeeping mode and using the 24-hour display option. NOT suitable for showering, bathing, swimming, snorkeling, water related work and fishing". ![]() ![]() 100 feet / 44 psi), the ISO standard meaning of which is: "Suitable for everyday use. The black version (F91W-1) is "30 meter / 3 bar" (i.e. The watch front is marked " Water Resist", but Casio reports different values for different variants of the watch. The quartz movement, designated Module 593, is powered by a single CR2016 3-volt lithium button cell. According to manufacturer estimates, the watch is reported to be accurate to ☓0 seconds per month. The watch uses a faint, green LED backlight located to the left of the display for illumination (in earlier versions it was an amber microlight). Other features include an hourly time beep and a single daily alarm lasting 20 seconds and an annual calendar, with adjustment for leap years not supported as the watch does not record the year. The stopwatch also has the feature to mark net and split time (lap). The F-91W is a chronograph, featuring a 1⁄ 100 second stopwatch with a count up to 59:59.99 (nearly one hour). The resin strap is 18 millimetres (0.71 in) at the fitting and 22 mm across the widest part of the lugs. The case is primarily made of resin, with a stainless steel caseback and buttons, with the manufacturer's module number, 593, stamped on the caseback. Specifications Design ĭesigned by Ryusuke Moriai as his first design for Casio, the case of the F-91W measures 37.5 by 34.5 by 8.5 millimetres (1.48 by 1.36 by 0.33 in). As of 2011, annual production of the watch is 3 million units, which makes it the most sold watch in the world. Introduced in 1989 as a successor of the F-87W, it is popular for its low price and long battery life. The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Some Japanese brands like Toshiba and Mitsubishi, do not have their own plants so contract out to their rivals or Chinese manufacturers.Casio F-91W-1 watch with a resin case and resin strap Duracell and Energizer do not have their own plants. Always look at the package being purchased. I can say that sticking to the German or Japanese brands tend to be made in the original manufacturing plants to avoid China, but this isnt guaranteed. This thin text is what is used on the die printer at the old-Sanyo button battery factory. You will notice for example if it is made by Fujitsu in Japan, you will notice a distinct thin text. You generally can tell where the battery is made by the text. This is I believe the Panasonic or Murata plant in Indonesia. Energizer is Made in Japan & Made in Indonesia: it depends on which contractor product you are looking at.Įxample: Energizer CR2016 Made in Indonesia.Hitachi-Maxell is Made in Japan or China.LR44 and SR44 are the same 357 button battery. The Silver Oxide SR44 tends to be Japanese, Swiss or German made, but LR44 Alkalines are Chinese made. This can be seen with 357 button batteries. Silver oxide and Lithium TEND to not be made in China, but not guaranteed. If for example you need one, avoid Alkaline as they tend to not last as long and are Chinese made. Generally, these will be the Alkaline & some Lithium button batteries. Murata (Formerly Sony) Panasonic(Formerly Sanyo) Varta Renata Hitachi-Maxell Fujitsu FDK (also partially formerly Sanyo) There are generally only 4-5 major battery manufacturers and you will notice for example the text on the battery itself is similar to other brands. Energizer didn't make this battery, this is actually a FDK(Fujitsu) made battery. Some data, most battery manufacturers don't make the button batteries. To be fair, most button batteries are Made in Japan, Germany, Indonesia.
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