This 6-in-1 tester focuses on nutrients: it reads nitrogen (N), phosphorus (P), and potassium (K) along with moisture and temperature, and grades your soil from Deficient to Rich so a reading turns into a feeding decision. Push the dual stainless probes into moist soil and read the values.
One honest point: the N, P, and K figures are estimated from soil conductivity, so read them as a direction, not a lab measurement. They are great for spotting when a nutrient is running low and for tracking whether feeding worked. For most thriving gardens you want to see nitrogen around 150 to 200 mg/kg and phosphorus around 60 to 100 mg/kg; below that, the grading scale flags "Deficient."
Read NPK as low, medium, or high trends and feed the nutrient that is running low. It also tracks moisture, so you know when to water, and temperature, which matters for germination. If you want pH and light too, see our 6 in 1 soil pH meter; for a simpler nutrients-only tool, the NPK soil tester focuses on N, P, and K.
Yieryi has built pH, EC, and TDS meters for more than ten years. A handheld nutrient tester is for trends and timing, not lab-grade numbers, and being straight about that is the point.
Does it really measure NPK precisely?
It estimates NPK from conductivity—a directional reference, not a lab measurement. Use it for trends; for exact figures, send a sample to a lab.
Why am I getting a "0" reading?
Usually the soil is too dry. Keep it slightly moist (about 40 to 70%) so the dual probes make good contact; avoid loose media like coco fiber or sand.
Can I use it in water or hydroponics?
No—it is made for natural, organic, and mixed plant soils. Liquids give unreliable readings and shorten probe life.
Measures: Nitrogen (N), phosphorus (P), potassium (K), moisture, temperature, fertility
NPK: 0–1999 mg/kg, estimated from conductivity (directional)
Fertility (EC): 0–1999 μS/cm
Moisture: 0%–99% (Dry to Wet)
Temperature: 0°C–60°C (32°F–140°F)
Probe: Dual stainless steel needles, insert about 8–12 cm
Display: 90° rotatable backlit LCD with Deficient/Rich grading
Calibration: Factory-calibrated
Power: 3 × AAA batteries
How to use it
Where it works best
Natural, organic, and mixed plant soils—indoor pots, gardens, orchards, and greenhouses. Not for water, hydroponics, coco fiber, or pure sand.
This comprehensive analyzer provides the precise data support needed for thriving balconies and lush greenhouses. By monitoring real-time fertility levels (us/cm), you can maintain the perfect environment for demanding crops like tomatoes, ensuring a vibrant harvest instead of disappointing, weak yields.
Simplify your plant care routine by eliminating the need for multiple tools; this 6-in-1 device tracks everything from root-zone temperature to precise Nitrogen, Phosphorus, and Potassium (NPK) ranges. Keep your soil humidity between 40-70% and temperature within 15-25°C (59-77°F) for optimal photosynthesis, effectively preventing common issues like root rot and heat stress.
From indoor potted plants to outdoor orchards and professional greenhouses, this compact tester solves the challenge of maintaining consistent soil quality across different environments. Use it to ensure your garden maintains a Phosphorus level of 60-100mg/kg, the sweet spot for robust root development and disease resistance in any agricultural or gardening scenario.
For accurate data, ensure the soil is slightly moist (ideally 40-70% humidity) so the dual probes can establish a proper electrical connection. Also, avoid testing in loose media like pure coconut fiber or sandy soil, which do not hold nutrients well enough for a standard reading.
Your NPK levels into five clear grades, from "Extremely Deficient" to "High," ensuring you never burn your plants with excess nutrients again. For high-yield cultivated soil, aim for a Nitrogen balance of 150-200mg/kg to prevent the stunted growth and yellowing leaves that plague most home gardeners.
No calibration is necessary. Your 6-in-1 Soil Tester is professionally calibrated at the factory to ensure high-precision accuracy right out of the box. You can start monitoring your soil NPK and fertility levels immediately without any complex setup.
This usually happens if the soil is too dry or unsuitable. For accurate data, ensure the soil is slightly moist (ideally 40-70% humidity) so the dual probes can establish a proper electrical connection. Also, avoid testing in loose media like pure coconut fiber or sandy soil, which do not hold nutrients well enough for a standard reading.
No. This device is specifically engineered for natural, organic, and mixed plant soils. Inserting the probes into liquids or pure water will result in inaccurate readings and may shorten the lifespan of the high-sensitivity dual needles.
For the most reliable NPK and moisture data, insert the dual stainless steel probes approximately 2/3 of the way (about 8-12cm) into the soil. This ensures the sensors are measuring the "root zone" where your plants actually absorb nutrients.
The tester provides real-time mg/kg data. For most thriving gardens, you want to see a Nitrogen (N) level of 150-200mg/kg and Phosphorus (P) of 60-100mg/kg. If your reading falls below these ranges, our built-in Nutrient Grading Scale will alert you that your soil is "Deficient," signaling it's time to fertilize.
