4-1 Soil Meter

4-in-1 Soil Meter

The fastest way to know what your plants actually need.
Measure moisture, pH, temperature, and light — all in one compact, root-safe device.

Accurate readings for pH, moisture, temperature & light
Backlit digital screen — easy to read, day or night
Single probe = less root disturbance
Indoor/outdoor use for any grow setup
No app, no calibration, no guesswork

$18.99

Soil health — simplified.

Roots don’t lie, but they stay hidden. The Humboldts Secret 4-in-1 Soil Meter helps you understand exactly what's going on below the surface, so you can fix it fast.

Whatever you're growing on the windowsill or in the garden, one quick reading gives you:

No more separate meters. Just one tool that simplifies your grow routine.

Soil pH: Catch imbalances quick

Light intensity: Know if your plants are getting enough

Temperature at root level: Crucial for seed starting

Soil moisture: Never drown or starve your roots

Soil pH: Catch imbalances quick

Light intensity: Know if your plants are getting enough

Temperature at root level: Crucial for seed starting

Soil moisture: Never drown or starve your roots

See How It Works

How to use the 4-in-1 meter.

1

Insert probe at least 2.5 inches into the soil

2

Get instant feedback on all 4 readings

3

Wipe clean between uses for accuracy

4

Works anywhere you grow: Indoor pots, outdoor beds, greenhouse setups, raised containers, and more

Gardener’s Tip: Use before watering and feeding to avoid overcorrecting.

Stop guessing. Start knowing.

Plants whisper their needs too late. The 4-in-1 Soil Meter doesn’t wait — it reveals problems before they take hold..

Overwatering. Nutrient lockout. pH swings. Temperature stress. All can all ruin your season’s harvest before you see the signs — unless you’re measuring. This tool lets you skip the trial-and-error and gain foresight, so you never lose another grow.

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Visible victories from gardeners like you.

Better than basic.

Most soil testers fall short. Cheap models are inaccurate, confusing, or only test one thing. The Humboldts Secret 4-in-1 Soil Meter is built for gardeners, not gimmicks.

4-in-1 readings: Replaces multiple tools

Single-probe design: Causes less root damage than dual probes

Digital & backlit: Clear readings, even in low light

Battery included: Ready to use out of the box

No setup needed: Zero calibration or syncing

Designed for gardeners who require accuracy for healthier roots, stronger plants, and smarter watering.

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FAQ: How the 4-in-1 soil meter helps you grow.

This soil meter combines four tools in one: it measures soil moisture levels, soil pH, temperature at the root zone, and available light intensity. These are key indicators of plant health and help you make better watering and feeding decisions.

Yes. It’s perfect for houseplants, raised beds, patio pots, herb gardens, and outdoor vegetables. It’s designed for both indoor and outdoor applications, wherever you need to monitor plant health.

No calibration is needed. The 4-in-1 meter is a plug-and-read device. Just insert the probe into the soil and get your readings instantly.

No. This device is designed specifically for use in soil. It should not be used in standing water or hydroponic systems. For hydro setups, we recommend using specialized digital EC or pH pens.

For accurate readings, insert the probe at least 2.5 inches into the soil. Avoid forcing it into dry or compacted soil, and do not use in rocky or gritty substrates that could damage the probe.

By giving you a real-time reading of soil moisture, you’ll know whether your plant actually needs water. That helps prevent one of the most common causes of root rot: watering before the soil has had a chance to dry.

Soil pH affects how plants absorb nutrients. With the built-in pH sensor, you can monitor imbalances before they lead to nutrient lockout. This is especially helpful if you're feeding with liquid nutrients or switching mediums.

Absolutely. The 4-in-1 Soil Meter is a perfect companion to Humboldts Secret nutrient kits, helping you check conditions before feeding. It gives you more control and better results, without the trial and error.

Yes. Our 4-in-1 soil meter is designed for use across potting mix, raised bed soil, native outdoor soil, and blended mediums. For best accuracy, avoid soils that are extremely dry or heavily compacted.

Grow with clarity, not confusion.

Think of the 4-in-1 Soil Meter as your crystal ball, without the learning curve or clouded judgement calls. This meter is trusted by gardeners like you for clear guidance — never guesswork.

Know the signals. Rule your soil. Grow with confidence.

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