• Electro-luminescent backlight
• Auto light switch, afterglow
• EEPROM  (will not lose memory when changing batteries)

Dive function

• Automatically measures water pressure, temperature and memorizes log data.
• Dive time: range; Up to 12 hours
• Measuring unit; 1 second (0''00''00~59''59''''99) ; 1 minute (1:00''00''''~23:59''59'''')
  

Depth:

• Measuring range; 0 to 80.0 m (0 to 263 ft) Measuring unit; 0.1 m (1 ft)
  *Changeover between meters(m) and feet(ft)
  System-specific nitrogen loading graph
• 20 sets of log data memories
  (dive month and date, dive number, dive start and end time, total dive time, maximum depth, average depth data and water temperature, surface interval); graph of system-specific nitrogen loading at the end of a dive

Dive profile function

• Records of the maximum depth reached during each minute of dive. Up to 20 profiles, each with 100 minutes of measurements.
• Surface interval measurement function
• Up to 48 hours

Thermometer

• Display range: -10 to 60 °C (14 to 140°F)
• Display unit: 0.1°C (0.2°F)
  *Changeover between Celsius(°C) and Fahrenheit(°F)

Daily alarm

Hourly time signal

Low battery warning

Auto-calendar (to year 2039)

12/24-hour formats

Regular timekeeping: Hour, minutes, seconds, am/pm, month, date, day, daylight saving on/off

Accuracy: ±15 seconds per month

Approx. battery life: 2 years on CR2025

Size of case
SPF-100 > 50.0 X 50.8 X 15.5 mm

Read the manual on-line. Simply click the link or cut and paste into your browser http://www.casio.co.jp/ww-e/pdf/qw2172.pdf (Adobe Acrobat Reader required - most new browsers have this installed)