Precise NPK and Temperature Measurement for Optimal Plant Growth
Accurately measures essential soil nutrients (nitrogen, phosphorus, and potassium) and temperature, providing valuable data for nutrient management and healthy plant growth.
NPK Soil Tester Meter for Plants | Yieryi
Soil NPK Sensor Description
An NPK soil tester reads the three nutrients plants need most—nitrogen (N), phosphorus (P), and potassium (K)—plus soil temperature. This one gives you those readings in seconds from a dual-needle probe, so you can tell whether it is time to feed or hold off, without mailing a sample to a lab.
Read it as a trend tool. The N, P, and K figures are a directional reference, not a lab measurement—useful for spotting when a nutrient runs low and tracking how your soil changes after you feed. For exact numbers you would send a sample to a lab; for "is my soil getting hungry," this is faster and repeatable.
Not sure how to read the three figures? Our guide to what the NPK numbers mean breaks them down.
What N, P, and K do
- Nitrogen (N) drives green, leafy growth. Low N often shows as pale or yellowing older leaves.
- Phosphorus (P) supports roots, flowers, and fruit.
- Potassium (K) builds hardiness—stems, disease resistance, and fruit quality.
It comes with a reference chart for typical NPK levels, so a reading becomes a decision. It also reads soil temperature.
Want pH and moisture too?
This tool focuses on nutrients. For pH, moisture, and EC in one probe, see our 8 in 1 soil sensor probe (its NPK is estimated the same way). To read salt and nutrient concentration directly, pair it with a soil EC meter.
Why Yieryi
Yieryi comes out of a measurement-instrument factory with more than ten years building pH, EC, and TDS meters. We will tell you straight: a handheld NPK tester is for trends and timing, not lab-grade numbers.
FAQ
Is the NPK reading lab-accurate?
No—it is a directional reading for tracking trends and timing feeding, not exact lab figures.
What does it measure?
Nitrogen, phosphorus, potassium, and soil temperature, on a backlit LCD, with a reference chart.
Does it need an app or batteries?
No app—it is standalone, runs on 3 AAA batteries, and shuts off automatically.
Technical Specifications
- Measures: Nitrogen (N), phosphorus (P), potassium (K) + soil temperature
- NPK range: 0–1999 mg/kg (directional, estimated)
- Temperature range: 0°C–60°C (32°F–140°F)
- Display: Backlit LCD
- Probe: Dual-needle metal, 80–130 mm insertion depth
- Power: 3 × 1.5V AAA batteries
- Auto power-off: 30 seconds
- Dimensions / weight: 268 × 58 × 31 mm / 158 g
- In the box: Tester, NPK reference chart, user manual
Soil NPK Sensor Applications
How to use it
- Water the soil lightly if dry.
- Push the dual-needle probe into the root zone (about 8–13 cm deep).
- Read N, P, K, and temperature; compare against the reference chart.
- Feed the nutrient running low, then recheck in a week.
Where it works best
Gardens, raised beds, containers, orchards, nurseries, greenhouses, and small farms — indoors and out.
Shipping & Returns
Shipping Policy
- Orders are processed within 1-2 business days (excluding weekends and holidays).
- Free shipping is available for the United States, select European countries, and various Asian regions, with a delivery timeframe of 7-20 business days.
- Duties and taxes are not included and will be collected by the carrier at delivery.
- Upon shipment, you’ll receive a tracking number via email for real-time updates.
Return Policy
- We offer a 7-day return policy, starting from the day you receive your item.
- Items must be unused, in their original condition with tags and packaging, and accompanied by proof of purchase.
Shipping Costs for Returns:
- Quality Issues: We cover the return shipping costs.
- Personal Reasons: Customers cover the return shipping costs.
Non-Returnable Items:
- Used or worn products.
- Sale/discounted/promotional items.
- Gift cards.
Refund Process:
- Refunds will be processed through your original payment method within 5-8 business days after approval.
Frequently Bought Together
NPK Soil Tester Meter for Plants | Yieryi
Easy-to-Use Interface with Clear LCD and Dual-Needle Probe
The simple two-button operation, high-definition LCD with backlight, and dual-needle probe ensure easy operation and accurate soil analysis.
Portable and Durable Design with Automatic Power-Off
The compact and lightweight design, combined with a metal protective coating on the probes and automatic shut-off feature, makes this tester portable, durable, and energy-efficient. Includes a reference chart for optimal NPK levels.
Growing In Action
FAQ
What is a Soil NPK Sensor and how does it work?
An NPK soil tester measures the levels of Nitrogen (N), Phosphorus (P), and Potassium (K) in your soil, along with temperature and sometimes pH. This helps you know exactly what nutrients your plants need, preventing over-fertilization and boosting healthy growth.
What is an NPK Soil Test used for?
A Soil NPK Sensor is a device used to measure the levels of Nitrogen (N), Phosphorus (P), and Potassium (K) in soil. These three nutrients are essential for healthy plant growth and improved agricultural productivity.
How accurate is this soil nutrient meter?
The digital sensor provides highly accurate readings for NPK within 0–1999 mg/kg, giving you reliable data for gardening, farming, or indoor plants. It ensures you apply the right fertilizer at the right time.
Can I use this soil tester for indoor plants?
Yes! It’s perfect for both indoor potted plants and outdoor gardens. For houseplants, it helps you monitor soil fertility and temperature, preventing common issues like yellow leaves or stunted growth.
What is the ideal soil temperature for plants?
Most vegetables and flowers thrive in soil temperatures between 18°C–26°C (65°F–78°F). The built-in thermometer helps you keep soil in the optimal range for faster germination and stronger roots.
Does the NPK tester require batteries?
Yes, it runs on 3 AAA batteries and features an automatic shut-off after 30 seconds to save power, making it convenient and long-lasting.
Can this soil tester be used for farming or greenhouse crops?
Absolutely. It’s designed for home gardeners, greenhouse growers, and small-scale farmers who want precise soil data to maximize crop yields and reduce fertilizer waste.
High Accuracy Readings
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Durable & Reliable Design
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User-Friendly Interface
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