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Amazon's Choice — 4.6 ★ (11,700+ Reviews)

HealthTree JKS50B Fingertip Pulse Oximeter

Track your blood oxygen saturation (SpO2) and pulse rate in 5–8 seconds with this compact, accurate fingertip oximeter. Large OLED display, one-button operation — perfect for home, travel, sports, and aviation.

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±2% Accuracy 30-Hour Battery 1-Year Warranty
HealthTree JKS50B Pulse Oximeter fingertip device
4.6

Amazon's Choice

★★★★★

Key Benefits

Why 11,700+ Buyers Chose the HealthTree JKS50B

Compact accuracy for anyone who needs reliable SpO2 and pulse readings in seconds — at home, on the go, or during sports.

Fast 5–8 Second Readings

Instantly measures blood oxygen saturation (SpO2) and heart rate with ±2% accuracy. No waiting, no guessing — just trusted results in seconds.

Large, Easy-to-Read OLED Display

Bright, high-contrast OLED screen shows SpO2, pulse rate, waveform bar graph, and signal strength in large digits — readable even in low light.

Compact & Travel-Friendly

Measures just 2.5" × 1.35" × 1.25" and weighs under 2 oz. Slip it in your pocket, gym bag, or carry-on for oxygen monitoring anywhere, anytime.

Perfusion Index (PI) Indicator

Built-in perfusion index shows the strength of blood flow at your fingertip. Helps ensure the most accurate reading every time you use it.

30-Hour Battery Life

Two included AAA batteries power up to 30 hours of continuous use. Auto-shutoff after 8 seconds of inactivity conserves battery life even further.

1-Year Manufacturer Warranty

Backed by a 1-year warranty from HealthTree. Packaged with batteries, a lanyard, and an instruction manual — ready to use right out of the box.

HealthTree JKS50B Pulse Oximeter OLED Display Close-up

For Home, Sports & Travel

Monitor Your Oxygen Levels Whenever (and Wherever) You Need

The HealthTree JKS50B is a compact, reliable pulse oximeter trusted by over 11,700 Amazon customers. Whether you live with asthma, COPD, sleep apnea, or just want peace of mind during workouts — this fingertip device gives you fast, accurate readings anywhere.

  • Home health monitoring — ideal for checking SpO2 during colds, flu recovery, or chronic conditions.
  • Active & athletic use — track oxygen saturation during running, cycling, climbing, and high-altitude sports.
  • Aviation & travel — monitors blood oxygen during flights, road trips, or altitudes above sea level.
  • One-button, finger-friendly — simply clip it on and press the button. No setup, no app, no complications.
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How to Use

Get Your Reading in 3 Simple Steps

01

Insert & Power On

Insert two AAA batteries (included). Slide the device open and clip it lightly onto your fingertip — it fits most finger sizes comfortably.

02

Press the Button

Press the single button to power on. The OLED screen illuminates instantly. Sit still with your hand relaxed at heart level.

03

Read Your Results

Your SpO2 percentage (normally 95–100%) and pulse rate appear in 5–8 seconds. The device auto-shuts off after 8 seconds to save battery.

Pro Tips for Accurate Readings

  • •Remove nail polish or acrylics before use for best accuracy.
  • •Keep your hand still and warm — cold fingers reduce accuracy.
  • •Avoid bright direct sunlight on the sensor during measurement.
  • •Expect lower SpO2 at higher altitudes (this is normal).

Real Customer Reviews

What Buyers Are Saying About the HealthTree JKS50B

★★★★★

"A must in our home! This oximeter gives me peace of mind during cold and flu season. Readings are fast and consistent compared to my doctor's device."

IS

InsaneReviewer

Verified Amazon Buyer

★★★★★

"It's perfect for my needs — compact, fits in my pocket, and is easy to read. Great value for the money. I use it every day for my COPD monitoring."

MJ

Verified Buyer

Walmart Customer

★★★★★

"Compact, lightweight, and accurate. I take it hiking and on flights to check oxygen at altitude. The display is bright and clear even outdoors."

RL

RunnerLife88

Verified Amazon Buyer

Amazon's Choice

★★★★★ 4.6 out of 5 — 11,700+ ratings

#6 Best Seller in Athletic & Aviation Pulse Oximeters

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FAQ

Common Questions About the HealthTree JKS50B Pulse Oximeter

What is a normal SpO2 reading?
A normal blood oxygen saturation (SpO2) reading for healthy adults is typically between 95% and 100%. Readings between 90% and 94% may indicate mild hypoxemia, and readings below 90% are considered low and should be discussed with a healthcare provider.
Is this pulse oximeter FDA approved?
The HealthTree JKS50B is an over-the-counter (OTC) device intended for non-medical, wellness monitoring use. While it is not individually FDA-cleared as a prescription medical device, it is manufactured to meet recognized pulse oximetry accuracy standards (±2% within the 70–100% SpO2 range). For medical diagnosis or treatment decisions, consult your healthcare provider.
How accurate is the HealthTree JKS50B?
The manufacturer states ±2% accuracy for SpO2 readings within the 70%–100% measuring range. The device also features a Perfusion Index (PI) indicator that shows the strength of blood flow, helping you know when readings are most reliable.
Can I use this for children?
The JKS50B is designed for adult finger sizes. For children, HealthTree offers a dedicated pediatric pulse oximeter (search for HealthTree Children's Pulse Oximeter) that is sized appropriately for smaller fingers. Always supervise children during use.
What batteries does it use?
The HealthTree JKS50B uses 2 standard AAA batteries, which are included in the box. The device provides approximately 30 hours of continuous use on a single set of batteries, with an auto-shutoff feature that activates after 8 seconds of inactivity.
Can I use this for sports and aviation?
Yes! The JKS50B is popular with athletes, hikers, pilots, and climbers who want to monitor oxygen saturation during high-intensity activities or at altitude. It is #6 in Amazon's Athletic & Aviation Pulse Oximeters category.

Get Fast, Reliable Oxygen Readings
Wherever Life Takes You

Join 11,700+ satisfied customers who trust the HealthTree JKS50B fingertip pulse oximeter. Compact, accurate, and ready to use out of the box.

View on Amazon — $9.99
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