Seiko Caliber M705

Manufacturer	Seiko
Caliber Number	M705, M705A
Movement Type	Quartz, digital
Display Type	Nematic Liquid Crystal with Field Effect Mode (FEM)
Diameter	34.2mm
Height	6.48mm
Jewel Count	No jewels (0)
Beat Rate / Frequency	28,800 bph / 4 Hz
Accuracy Rating	Less than 15 seconds/month
Battery Cell #	CR2025 (lithium, 3 V)
Battery Life	3 years
Current Consumption	2.2 uA (movement) / 1.8 uA (circuit block)
Regulator	Trimmer condenser
Functions	See below…
Country of Manufacture	Made in Japan
Known Models	Seiko Scubamaster (Ref: M705-5A10, M705-5A00) (Add your watch to the comments below…)

The Seiko caliber M705 (M705A) is a digital quartz watch movement found in various Seiko digital Scuba Diver’s watches.

In Seiko’s own words:

“The Seiko Scubamaster Cal. M705 is a computerized diver’s watch featuring a built-in electronic depth gauge and automatically displays the data required in making a dive.”

Functions:

In addition to the normal digital time and calendar display, the M705 also has:

• Depth meter up to 80m
• Dive display
• Dive table
• Diver’s log
• Alarm (daily)
• Warning/communication beeps
• Illuminating backlight
• Battery life indicator (EOL)
• All Clear (AC) Reset

Instructions Manual:

Official M705 Technical Guide/Tech Sheets (pdf):

Additional Resources:

• More Seiko mentions