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.
It comes with a reference chart for typical NPK levels, so a reading becomes a decision. It also reads soil temperature.
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.
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.
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.
How to use it
Where it works best
Gardens, raised beds, containers, orchards, nurseries, greenhouses, and small farms — indoors and out.
Use the N, P and K readings as directional estimates for comparing soil conditions over time, together with soil temperature. This is useful for routine monitoring and feeding decisions, but it is not a laboratory nutrient analysis.
The backlit LCD and simple controls make it easy to check N, P, K estimates and soil temperature in the root zone. Use the same testing method each time for more useful trend comparison.
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.
This handheld NPK tester displays nitrogen, phosphorus and potassium estimates together with soil temperature. The NPK values are intended for routine trend monitoring rather than laboratory nutrient quantification.
It is useful for comparing nutrient trends over time, checking changes after feeding and identifying when soil conditions may deserve closer attention.
The NPK values are directional estimates, not laboratory nutrient measurements. Use them for trend comparison and routine monitoring. For precise nutrient concentrations or fertilizer recommendations, use a laboratory soil test.
Yes. It can be used for routine monitoring in gardens, greenhouses, nurseries and small farms. For crop programs that require precise nutrient recommendations, combine field monitoring with laboratory soil testing.
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.
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.
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.
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