1. Introduction
The LinkSun G-425-1 Blood Glucose Monitor Kit is designed for accurate and reliable self-testing of blood glucose levels at home. This kit provides a convenient and efficient way to monitor blood sugar, featuring a no-coding design, quick test time, and a large display for easy readability. Regular monitoring is crucial for managing diabetes effectively.
2. What's in the Box
Your LinkSun G-425-1 Blood Glucose Monitor Kit includes the following components:
- 1 x G-425-1 Blood Glucose Monitor
- 1 x Lancing Device
- 100 x Test Strips (50pcs x 2 vials)
- 100 x Lancets (50pcs x 2 vials)
- 1 x Control Solution
- User Guide
- Carrying Case

Figure 2.1: Complete LinkSun G-425-1 Blood Glucose Monitor Kit.
3. Setup
3.1. Installing Batteries
The G-425-1 monitor uses Alkaline batteries. Open the battery compartment cover on the back of the device and insert the batteries, ensuring correct polarity. Close the cover securely.
3.2. Preparing the Lancing Device
- Unscrew the lancing device cap.
- Insert a new lancet firmly into the lancet holder.
- Twist off the protective cap from the lancet.
- Replace the lancing device cap.
- Adjust the penetration depth by rotating the top of the cap. The device offers 5 levels of lancing strengths; choose a setting appropriate for your skin type (1-2 for soft skin, 3-5 for thicker skin).
- Pull back the cocking barrel until it clicks, indicating it is ready to use.

Figure 3.1: Lancing device with adjustable depth settings for comfortable blood sample collection.
4. Operating Instructions (Blood Glucose Testing)
The LinkSun G-425-1 Blood Glucose Monitor features a no-coding design for simplified testing. Follow these steps for an accurate blood glucose measurement:
- Prepare: Wash your hands thoroughly with soap and warm water. Dry them completely.
- Insert Test Strip: Remove a test strip from its vial and immediately close the vial cap tightly. Insert the test strip into the meter with the contact bars end first. The meter will automatically turn on and display a blood drop symbol, indicating it is ready for a blood sample.
- Obtain Blood Sample: Place the prepared lancing device firmly against the side of your fingertip. Press the release button to prick your finger. A small drop of blood (0.7 µL microblood collection) will form.
- Apply Blood Sample: Gently touch the absorbent hole at the tip of the test strip to the blood drop. The blood will be automatically drawn into the strip. Do not smear the blood.
- Read Result: The meter will begin a 5-second countdown. After the countdown, your blood glucose result will be displayed on the large screen.
- Eject Strip & Lancet: Remove the used test strip from the meter and dispose of it properly. Carefully remove the used lancet from the lancing device using the one-button lancet rejection feature and dispose of it in a puncture-proof container.

Figure 4.1: Step-by-step guide for blood glucose testing.
4.1. Meter Operation and Memory
The meter automatically turns on when a test strip is inserted and turns off after a period of inactivity or when the strip is removed. It stores up to 500 readings with date and time. To review past results, press the 'M' button to turn on the meter, then press 'M' again to cycle through the most recent test results. Long press 'M' to turn off the meter.

Figure 4.2: Auto-Standby Mode for convenient use.
5. Maintenance and Care
5.1. Cleaning the Monitor
Wipe the exterior of the meter and lancing device with a soft, damp cloth. Do not immerse the device in water or use harsh cleaning agents. Ensure no liquid enters the test strip port.
5.2. Storage
Store the blood glucose monitor, test strips, and lancets in a cool, dry place, away from direct sunlight and extreme temperatures. Keep test strip vials tightly closed after each use to prevent moisture exposure, which can affect accuracy. Do not use expired test strips or control solution.
5.3. Control Solution Testing
A control solution is included to verify the accuracy of your meter and test strips. Perform a control solution test when:
- You open a new vial of test strips.
- You suspect the meter or test strips are not working correctly.
- Your test results are inconsistent with your symptoms or how you feel.
- You have dropped the meter.
To perform a control solution test:
- Insert a test strip into the meter when it is off.
- Press the 'M' button to enter CTL Mode.
- Apply one drop of control solution to the test strip.
- Compare the result displayed on the meter with the range printed on the test strip vial label. The result should fall within the specified range.

Figure 5.1: Performing a control solution test.
6. Troubleshooting
6.1. Inconsistent Readings or Error Messages
If you experience inconsistent readings or error messages (e.g., 'LO' reading for control solution), consider the following:
- Check Test Strips: Ensure test strips are not expired and the vial cap was tightly closed after previous use. Moisture can affect strip integrity.
- Perform Control Solution Test: As described in Section 5.3, use the control solution to verify the meter and strips are functioning correctly. If the control solution result is out of range, replace the test strips.
- Sufficient Blood Sample: Ensure you apply enough blood to the test strip. The meter requires a 0.7 µL sample.
- Environmental Factors: Extreme temperatures or humidity can affect results. Test in a moderate environment.
6.2. Understanding Result Variations
It is normal for blood glucose results to vary slightly between different brands of meters or between home and laboratory tests. This is due to different technologies and sample types.

Figure 6.1: Why results may vary between different brands.

Figure 6.2: Differences between home and hospital blood glucose results.
If issues persist, contact LinkSun customer support.
7. Specifications
| Feature | Specification |
|---|---|
| Model Name | G-425-1 |
| Product Dimensions | 7.3"L x 1.8"W x 7.5"H |
| Item Weight | 0.4 Pounds |
| Test Time | 5 seconds |
| Blood Sample Volume | 0.7 µL |
| Memory Capacity | 500 readings |
| Coding | No Coding Required |
| Battery Type | Alkaline |
| Manufacturer | bioland |
8. Important Safety Information
Indications: This device is intended for use by people with diabetes mellitus for self-testing blood glucose.
- This device is for in vitro diagnostic use only. Do not use it for the diagnosis of diabetes or for screening purposes.
- Always consult your healthcare professional for interpretation of your blood glucose results and for any medical advice.
- Keep the device and all components out of reach of children.
- Dispose of used lancets and test strips according to local regulations for biohazardous waste.
- Do not use the device if it appears damaged or is not functioning properly.

Figure 8.1: Blood Glucose Indicator Card (for reference only; consult your doctor).
9. Warranty and Support
LinkSun is committed to providing high-quality products. For any questions, technical assistance, or warranty information regarding your G-425-1 Blood Glucose Monitor Kit, please contact LinkSun customer support through the retailer where you purchased the product or visit the official LinkSun website for contact details.