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. Use the NPK values as directional estimates and compare changes over time under similar soil conditions. Do not treat one handheld reading as a universal fertilizer threshold.
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. Use moisture and temperature readings to compare root-zone conditions over time. Appropriate moisture and temperature ranges vary by plant, growing medium and environment.
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 repeated phosphorus estimates to compare nutrient trends under similar soil conditions. Do not treat one phosphorus range as a universal target for every crop or growing system.
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.
The tester organizes estimated NPK readings into simple grading levels to help you compare nutrient trends. Use these values as directional references rather than universal fertilizer targets, and confirm precise nutrient needs with a laboratory soil test when necessary.
No user calibration is required according to the product instructions. Follow the product manual for setup, measurement and routine use.
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 displays estimated NPK values for routine trend monitoring. Compare readings taken under similar soil conditions rather than treating one value as a universal deficiency threshold. For precise nutrient concentrations or fertilizer recommendations, use a laboratory soil test.
