Citizen Caliber C010: Analog-Digital Dive Movement with Depth Sensor and Log Memory

The Citizen Caliber C010 is a highly specialized analog-digital quartz movement, engineered for underwater exploration and sporting environments. Found in select Promaster Aqualand diver watches, this caliber integrates depth measurement, dive timing, chronograph functions, and log memory, making it a trusted companion for both recreational and professional divers.

With ISO-certified water resistance and intuitive digital feedback, the C010 is more than a watch—it’s a compact dive computer on the wrist, backed by Citizen’s reputation for robust quartz technology.

Key Features

The C010 combines both analog and digital technologies in a single module. Main functions include:

• Analog time display: Hour, minute, and central seconds

• Digital display (LCD): Used for dive, chronograph, and alarm functions

• Depth meter: Measures diving depth up to 80 meters (approx.)

• Dive time counter: Starts automatically upon submersion (~1.5m)

• Log memory: Stores previous dive data (max depth, dive duration)

• Chronograph: Measures up to 24 hours in 1/100-second increments

• Alarm: One daily audible alarm

• Calendar: Day and date via digital screen

• Water temperature display

• Backlight: For LCD display in dark environments

• Water resistance: Typically 200 meters (ISO 6425 compliant)

This feature set ensures that divers are equipped with real-time data underwater—without needing to rely on separate equipment.

Eco-Drive and Battery Operation

Unlike some newer Promaster models, the C010 is battery-powered, not Eco-Drive. It uses a silver oxide cell to drive both the analog and digital functions.

• Battery type: CR2016 (or equivalent lithium coin cell)

• Battery life: Approx. 2 years under normal use

• Low battery warning: LCD display may dim or stop; analog hands may freeze

Professional battery replacement is recommended to preserve water resistance seals, especially due to its diver certification.

Dive Functionality

The C010 is tailored to meet the needs of divers through the following functions:

Depth Measurement:

• Activates automatically when submerged past 1.5 meters

• Measures current depth in real-time

• Maximum readable depth: ~80 meters (subject to model and conditions)

• Uses a pressure sensor to detect changes

Dive Time Tracking:

• Dive duration starts as soon as depth threshold is reached

• Automatically records dive start and end time

• After surfacing, dive time remains visible for review

Log Memory:

• Automatically saves:

  • Date of last dive

  • Maximum depth reached

  • Total dive time

• Useful for personal safety tracking and dive logbooks

This functionality is ideal for both casual divers and more technical underwater excursions.

Chronograph and Alarm

• Chronograph function:

  • Digital stopwatch measuring up to 24 hours

  • Resolution: 1/100 seconds

  • Ideal for timing sports, rest periods, or surface intervals

• Alarm:

  • Single daily alarm, programmable through the digital interface

  • Audible tone, loud enough for daily reminders or dive prep

These features enhance the C010’s value even beyond underwater use.

Time and Calendar Setting

The watch offers a multi-button interface, typically using four buttons:

1. Mode button: Cycles through TIME, DIVE, CHRONO, ALARM, and LOG

2. Set/Adjust button: Used to initiate time or calendar setting

3. Start/Stop button: For chronograph and timer control

4. Reset/Recall button: For stopwatch and log data navigation

Analog time is set using a traditional crown or pusher combination, depending on the model.

Display Design and Build

Watches equipped with the C010 movement are designed for high visibility and rugged durability:

• Analog hands with luminous coating

• Bold markers for legibility underwater

• Digital screen for secondary functions

• Stainless steel or titanium case

• Screw-down crown and caseback

• Uni-directional bezel for manual dive timing

• Rubber dive strap or expandable stainless bracelet

These timepieces are fully compliant with ISO 6425 standards, ensuring dive safety and reliability.

Ideal Wearers

The C010 is perfect for:

• Scuba divers and free divers

• Outdoor adventurers

• Watch collectors seeking analog-digital hybrid divers

• Professionals in marine or water sports industries

• Anyone who values durability with useful functions

Summary

The Citizen Caliber C010 is a purpose-built analog-digital dive watch movement, offering essential underwater tools like depth measurement, dive time tracking, and log memory—all in a compact, wearable format. With strong build quality and reliable battery operation, it remains one of Citizen’s most respected dive modules. Whether you're submerged 60 meters below or walking into a boardroom, this movement is engineered to perform.