1. Introduction
This manual provides essential instructions for the safe and effective use of your Home Studio Collection Fingertip Pulse Oximeter LK87. This device is designed to measure blood oxygen saturation (SpO2) and pulse rate through a finger. It is intended for sports and daily use only, not for medical diagnosis or treatment.
Please read this manual thoroughly before use and retain it for future reference.
2. Safety Information
- This device is not intended for continuous monitoring.
- Do not use the oximeter in an MRI or CT environment.
- Do not use the oximeter on the same hand/arm being used for blood pressure measurement.
- Avoid placing the oximeter on fingers with nail polish, especially dark colors, as this may lead to inaccurate readings.
- Ensure the finger is warm and relaxed for accurate measurements. Movement can affect readings.
- Keep the device away from direct sunlight, high temperatures, and moisture.
- This device is not a substitute for professional medical advice. Consult a healthcare professional if you have concerns about your health.
3. What's in the Box
Upon unpacking, please verify that all items are present and undamaged:
- 1 x Fingertip Pulse Oximeter (Model LK87)
- 2 x AAA Batteries
- 1 x Lanyard
- 1 x User Manual (this document)

Image: The pulse oximeter, its packaging, two AAA batteries, and a lanyard.
4. Setup
4.1 Battery Installation
- Open the battery cover located on the back of the oximeter.
- Insert 2 AAA batteries with correct alignment: Positive (+) end facing the top, Negative (–) end facing the bottom. Follow the polarity markings inside the compartment to ensure proper function.
- Close the battery cover securely after installation.

Image: A detailed view of the battery compartment with two AAA batteries being inserted, showing correct polarity.
4.2 Attaching the Lanyard
Thread the included lanyard through the lanyard loop hole on the oximeter for convenient carrying.

Image: The pulse oximeter with its lanyard and batteries, ready for use.
4.3 Removing Protective Film
If present, gently peel off any protective film from the display screen before first use to ensure clear visibility.
5. Operating Instructions
5.1 Taking a Measurement
- Ensure the oximeter has fresh batteries installed.
- Open the clamp and place one of your fingers (preferably the index finger) into the rubber opening of the oximeter. Ensure your finger is fully inserted and resting on the sensor.
- Press the power button once to turn on the device.
- Keep your hand still and avoid movement during the measurement.
- Wait a few seconds (typically 8 seconds) for your SpO2 and pulse rate to appear on the screen.
- The device will automatically power off after 8-15 seconds of inactivity.

Image: Illustration of finger placement in the oximeter and the quick measurement time.
5.2 Understanding the Display
The display shows the following information:
- SpO2 (%): Blood Oxygen Saturation Level. A healthy level typically ranges between 95% to 100%.
- PR (bpm): Pulse Rate (beats per minute).
- Perfusion Index (PI): (If available on your model) Indicates the strength of the pulse signal.
- Pulse Capture Waveform: (If available on your model) A graphical representation of your pulse.
- Battery Low Voltage Indicator: Appears when battery power is low.

Image: A visual guide to the information displayed on the oximeter screen.
5.3 Changing Display Mode/Direction
Some models allow changing the display mode or direction by briefly pressing the power button while the device is on and a finger is inserted. Refer to the specific instructions on the device or packaging for details.

Image: Overview of device features, including display orientation options.
6. Maintenance
- Cleaning: Wipe the surface of the oximeter with a soft cloth dampened with alcohol. Do not immerse the device in water or other cleaning solutions.
- Storage: Store the oximeter in a cool, dry place, away from direct sunlight and extreme temperatures. If not in use for an extended period, remove the batteries to prevent leakage.
- Battery Replacement: Replace batteries when the low battery indicator appears on the display.
7. Troubleshooting
If you encounter issues with your pulse oximeter, refer to the following common solutions:
- Device does not turn on:
- Check that the batteries are correctly installed with the proper polarity.
- Ensure the batteries are charged. Replace them if necessary.
- Clean the battery contacts if they appear dirty.
- Inaccurate or inconsistent readings:
- Ensure your finger is fully inserted into the device.
- Remain still and avoid movement during measurement.
- Ensure your hand and finger are warm. Cold fingers can affect accuracy.
- Remove any nail polish, especially dark colors, as it can block the sensor.
- Avoid bright external light directly on the sensor. The shading design helps, but extreme light can interfere.
- "Finger out" message: This indicates the device cannot detect your finger or the signal is too weak. Reinsert your finger, ensuring proper placement and stillness.
Troubleshooting Videos
Video: Instructions on how to address the oximeter not powering on, focusing on battery alignment.
Video: A guide to unpacking and initial use of the pulse oximeter.
8. Specifications
| Feature | Specification |
|---|---|
| Model | LK87 |
| Power Source | 2 x AAA batteries (included) |
| Measurement Accuracy | +/-2% |
| SpO2 Measuring Range | 30% - 100% |
| Pulse Rate Measuring Range | 30 - 250 bpm |
| Automatic Power Off | After 8-15 seconds of inactivity |
| Dimensions | 2.99 x 2.2 x 1.54 inches |
| Weight | 1.45 ounces (without batteries) |
9. Warranty and Support
For warranty information or customer support, please refer to the contact details provided with your product packaging or visit the official Home Studio Collection website. Keep your purchase receipt as proof of purchase.