1. Introduction
Thank you for purchasing the CHOICEMMED MD300C29 Finger Pulse Oximeter. This device is designed to accurately measure your blood oxygen saturation (SpO2) and pulse rate. It is intended for use by sports and health enthusiasts, such as mountain climbers, skiers, bikers, or anyone interested in measuring their SpO2 and pulse rate. This manual provides essential information for the safe and effective operation of your oximeter. Please read it thoroughly before use and keep it for future reference.
2. What's in the Box
Upon opening the package, please verify that all the following items are included:
- Fingertip Pulse Oximeter
- Lanyard
- User Manual
- 2X AAA Batteries

Image: All items included in the CHOICEMMED MD300C29 package.
3. Product Features
- Accurate and Reliable: Accurately determine your SpO2 (blood oxygen saturation levels), pulse rate, and pulse strength in 10 seconds and display it conveniently on a large digital LED display.
- Full SpO2 Value: The only LED pulse oximeter that can read and display up to 100% for SpO2.
- Sport/Health Enthusiasts: For sports enthusiasts like mountain climbers, skiers, bikers, or anyone interested in measuring their SpO2 and pulse rate. SpO2 and Pulse Rate now faces instead of away from the user for an easy read.
- Accommodates Wide Range of Finger Sizes: Finger chamber with SMART Spring System. Works for ages 12 and above.
- Loaded with Accessories: Includes 2X AAA BATTERIES that will allow the pulse oximeter to be used right out of the box, and a LANYARD for convenience.

Image: Detailed view of the OLED display features.
4. Product Overview and Components
The CHOICEMMED MD300C29 Finger Pulse Oximeter is designed for ease of use and accurate readings. Familiarize yourself with its key components:

Image: Labeled diagram of the oximeter's external features.

Image: Internal components of the oximeter.
5. Setup
5.1 Battery Installation
Your oximeter requires 2 AAA batteries (included). Follow these steps to install them:
- Open the battery compartment cover on the back of the device.
- Insert the two AAA batteries according to the polarity indicators (+ and -) inside the compartment.
- Close the battery compartment cover securely.
5.2 Initial Use
Before taking your first measurement, ensure the batteries are correctly installed.

Image: The CHOICEMMED MD300C29 Finger Pulse Oximeter ready for use.
6. Operating Instructions
6.1 Taking a Measurement
Follow these simple steps for a fast and accurate measurement:
- Open Oximeter: Gently squeeze the oximeter to open the finger chamber.
- Place your Finger in the Oximeter: Insert one of your fingers (preferably the index or middle finger) into the rubber opening of the oximeter, ensuring your fingernail is facing upwards.
- Press the Power Button: Press the power button once to turn on the device.
- Waiting for Results: Keep your hand still. The readings for SpO2 and pulse rate will appear on the display within a few seconds.

Image: Step-by-step guide for taking a measurement.
6.2 Display Modes
The MD300C29 features a patented multi-directional display, allowing for easy viewing from various angles. Press the power button briefly while the device is on to cycle through the available display modes (4 directions, 6 modes).

Image: Multi-directional display options.
7. Maintenance
7.1 Cleaning
- Clean the surface of the oximeter with a soft cloth dampened with medical alcohol (70% ethanol or isopropanol) after each use.
- Do not immerse the device in water or any other cleaning solution.
- Ensure the device is completely dry before reuse.
7.2 Storage
- Store the oximeter in a cool, dry place, away from direct sunlight, high temperatures, and moisture.
- If the device will not be used for an extended period, remove the batteries to prevent leakage and damage.
7.3 Battery Replacement
When the low battery indicator appears on the display, replace the batteries immediately to ensure accurate readings. Refer to section 5.1 for battery installation instructions.
8. Troubleshooting
If you encounter any issues with your oximeter, please refer to the table below for common problems and their solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| No display after turning on | Batteries are dead or incorrectly installed. | Replace batteries or re-install them correctly, observing polarity. |
| Display shows '---' or unstable readings | Finger not inserted properly, finger too small/large, or excessive movement. | Re-insert finger correctly, ensure it's still, try a different finger. |
| Device turns off automatically | Normal auto-off feature (after 8 seconds of no signal) or low battery. | This is normal. If unexpected, check battery level. |
| Readings seem inaccurate | Cold fingers, nail polish, artificial nails, or poor circulation. | Warm hands, remove nail polish/artificial nails, ensure good circulation. |
9. Specifications
| Specification | Value |
|---|---|
| Brand | CHOICEMMED |
| Model | MD300C29 |
| Colour | Blue |
| Number of Batteries | 2 AAA batteries required (included) |
| Battery Life | 32 Hours |
| Item Weight | 90 g |
| Product Dimensions (LxWxH) | 5.5 x 4 x 3 cm |
| Manufacturer | Beijing Choice Electronics Technology Company Limited |
| Country of Origin | Italy |
10. Warranty and Support
The CHOICEMMED MD300C29 Finger Pulse Oximeter comes with a 12-month warranty from the date of purchase. This warranty covers manufacturing defects and material faults under normal use.
For technical support, warranty claims, or any questions regarding your device, please contact the retailer or the manufacturer's customer service department. Please have your purchase receipt and product model number ready when contacting support.





