The Complete Guide to Using the Spinegear CK-A138 (AXD-809) Blood Pressure Monitor
The Complete Guide to Using the Spinegear CK-A138 Blood Pressure Monitor (AXD-809)
📥 Download Official User Manual (PDF)
Table of Contents
- What is the Spinegear CK-A138?
- Is the CK-A138 the same as AXD-809?
- What's in the Box?
- Features
- Before First Use
- Charging the Monitor
- How to Fit the Cuff Correctly
- Correct Sitting Position
- How to Take Your Blood Pressure
- Understanding Your Results
- WHO Blood Pressure Classification
- Memory Function
- Two User Mode
- Setting the Date & Time
- Voice Function
- Changing mmHg to kPa
- Error Codes Explained
- Cleaning & Storage
- Frequently Asked Questions
- Download the PDF Manual
What is the Spinegear CK-A138?
The Spinegear CK-A138 is a fully automatic rechargeable upper arm blood pressure monitor designed for home blood pressure monitoring.
Using oscillometric technology, it measures:
- Systolic blood pressure
- Diastolic blood pressure
- Pulse rate
The monitor automatically inflates the cuff, measures your blood pressure and displays your readings in seconds. The manual also states that the device is intended for adult blood pressure and pulse measurements and is designed for home use.
Is the Spinegear CK-A138 the Same as AXD-809?
Yes.
The Spinegear CK-A138 and AXD-809 are the same blood pressure monitor sold under different branding.
Both models have:
- identical buttons
- identical menu system
- same rechargeable battery
- same memory
- same cuff
- same display
- same operation
Therefore this guide applies to both devices.
Main Features
✅ Rechargeable lithium battery
✅ Fully automatic inflation
✅ Large LCD display
✅ Voice guidance
✅ Dual user memory
✅ 90 readings per user
✅ Irregular heartbeat indicator
✅ WHO blood pressure indicator
✅ Automatic shut off
These features are illustrated in the manual's overview of the display, controls and memory functions.
What's Included
Inside the box you receive:
- Blood Pressure Monitor
- Upper Arm Cuff
- USB Charging Cable
- User Manual
Before Using Your Monitor
Before taking your first reading:
- Charge the battery fully
- Connect the cuff securely
- Sit quietly for at least five minutes
- Avoid exercise beforehand
- Avoid caffeine
- Avoid smoking
These preparation steps align with the usage recommendations shown in the manual.
How to Charge the CK-A138
Simply connect a standard 5V 1A USB charger.
The battery icon shows the charging status.
When all battery bars are displayed the monitor is fully charged. The manual recommends using a 5V/1A charger and explains the battery indicator behaviour.
How to Fit the Blood Pressure Cuff
Correct cuff placement is essential for accurate readings.
Step 1
Insert the cuff connector.
Step 2
Place your arm through the cuff.
Step 3
Position the cuff 1–2 cm above your elbow.
Step 4
Keep the air tube running down the inside of your arm.
Step 5
Tighten the cuff so it is snug but comfortable.
The illustrated cuff placement guide in the manual shows the correct positioning relative to the elbow and arm.
Correct Sitting Position
For the most accurate blood pressure readings:
✔ Sit upright
✔ Keep your back supported
✔ Place your feet flat on the floor
✔ Rest your arm on a table
✔ Keep the cuff level with your heart
✔ Stay still
✔ Do not talk
The posture illustration and notes in the manual recommend these practices and advise measuring at the same time each day with the same arm.
How to Take a Blood Pressure Reading
- Switch the monitor on.
- Press START/STOP.
- The cuff inflates automatically.
- Wait while the monitor measures your blood pressure.
- Your blood pressure and pulse appear on screen.
- The cuff deflates automatically.
The manual also notes that the display will turn off automatically after a period of inactivity.
Understanding Your Blood Pressure Reading
Your monitor displays:
SYS
Your systolic pressure
DIA
Your diastolic pressure
Pulse
Heart beats per minute
WHO Blood Pressure Classification
The monitor uses internationally recognised blood pressure ranges.
| Category | Blood Pressure |
|---|---|
| Optimal | Below 120/80 |
| Normal | 120–129 / 80–84 |
| High Normal | 130–139 / 85–89 |
| Mild Hypertension | 140–159 / 90–99 |
| Moderate Hypertension | 160–179 / 100–109 |
| Severe Hypertension | 180+/110+ |
The manual includes a WHO/ISH classification chart showing these categories.
Memory Function
The CK-A138 stores:
- 90 readings
- per user
- 2 users
Total storage:
180 readings
You can review previous readings using the MEM button, and older readings are overwritten once the memory is full.
Two User Mode
Ideal for couples.
User 1
and
User 2
can each store their own blood pressure history independently.
Date & Time Setup
Hold the SET button for approximately three seconds.
You can then adjust:
- Year
- Month
- Day
- Hour
- Minute
The manual also allows language and voice settings during the setup sequence.
How to Turn Voice On or Off
While in the settings menu:
Press MEM
Choose:
- Voice ON
- Voice OFF
The manual describes this option for voice-enabled models.
Switching Between mmHg and kPa
The monitor supports two measurement units:
- mmHg
- kPa
You can change between them using the settings procedure described in the manual.
Common Error Codes
| Error | Meaning |
|---|---|
| ErU | Inflation problem |
| ErH | Pressure too high |
| Er1 | Pulse not detected |
| Er2 | Movement or interference |
| Er3 | Measurement failed |
These troubleshooting codes are listed in the manual's error table.
Cleaning & Storage
To keep your monitor in good condition:
- Wipe with a soft cloth.
- Avoid excessive moisture.
- Do not use solvents.
- Store in a cool, dry place.
- Recharge the battery regularly if not in frequent use.
These maintenance recommendations are summarised from the storage section of the manual.
Frequently Asked Questions
Is CK-A138 accurate?
The manual specifies an accuracy of ±3 mmHg for blood pressure measurements under the stated operating conditions.
Can two people use it?
Yes.
Each user has independent memory storage.
Can I turn the voice off?
Yes.
Use the Settings menu.
Does it recharge?
Yes.
It has a rechargeable lithium battery.
Is it suitable for everyday monitoring?
Yes.
The manual describes it as suitable for regular home blood pressure monitoring by adults, while advising users to consult a healthcare professional rather than self-diagnosing based on readings alone.
Download the Official User Manual
Need the complete operation guide?
Download the official Spinegear CK-A138 / AXD-809 User Manual (PDF) here.
