9 Best Soil Moisture Meters with Long Probes (October 2026)
The best soil moisture meters with long probes for trees and deep roots include the XLUX Long Probe Plant Soil Moisture Meter for potted trees, the XLUX 2 Pack Long Probe Plant Soil for paired comparisons, and the Dr.meter 2 Pack Long Probe Soil Moisture for color-coded checks.
On this page (5 sections)
The best soil moisture meter with a long probe for most tree owners is the XLUX Long Probe Plant Soil Moisture Meter, which gives an immediate dial reading and uses a single probe. Choose ECOWITT for deeper measurement with a remote display, or a two-pack if you need to compare separate spots.
A tree's soil can be damp near the surface and dry lower down. A longer probe helps you check beyond the top layer, but its useful depth depends on the meter's design and how well the probe contacts the soil.
For a quick primer on what a soil moisture sensor measures, start with the difference between a spot reading and ongoing monitoring. Then use our guide on how to use a soil moisture meter to place the probe carefully.
Our picks at a glance
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Best for color-coded checksDr.meter 2 Pack Long Probe Soil Moisture
9.5/10 our score
See it on Amazon
- 4
Check itTennedriv Green Long Probe Soil Moisture Meter
Best for deep-rooted plants - 5
Check itECOWITT WH51L Soil Moisture Sensor with 1m/3.28ft
Best for remote deep readings - 6
Check itDr.meter Long Probe Soil Moisture Meter Tester
Best for single-plant checks - 7
Check itNexusLab Wireless Soil Moisture Meter with LCD
Best for multi-zone gardens - 8
Check itVaromorus Soil Sampler Probe 36" Stainless Steel
Best for soil core sampling - 9
Check itHOMESTEAD 36-Inch Soil Probe Rod with wide
Best for underground locating
Best soil moisture meter long probe picks for trees
The XLUX Long Probe Plant Soil Moisture Meter is the top pick for a simple spot check, followed by options for comparing sites, remote readings, and soil sampling. We compared their probe approach, display and setup needs for this guide.
| Product | Best for | Reading | Probe | Power | Our score |
|---|---|---|---|---|---|
| XLUX Long Probe Plant Soil Moisture Meter | potted trees | Dry, moist or wet zones with 10 scales | 5.5 in longer than regular styles | Battery-free | 9.7 |
| XLUX 2 Pack Long Probe Plant Soil | paired comparisons | Dry, moist or wet zones with 10 scales | 5.5 in longer than regular styles | 9.6 | |
| Dr.meter 2 Pack Long Probe Soil Moisture | color-coded checks | Battery-free | 9.5 | ||
| Tennedriv Green Long Probe Soil Moisture Meter | deep-rooted plants | No batteries required | 9.3 | ||
| ECOWITT WH51L Soil Moisture Sensor with 1m/3.28ft | remote deep readings | 9.2 | |||
| Dr.meter Long Probe Soil Moisture Meter Tester | single-plant checks | Single probe | Battery-free | 9.0 | |
| NexusLab Wireless Soil Moisture Meter with LCD | multi-zone gardens | 8.7 | |||
| Varomorus Soil Sampler Probe 36" Stainless Steel | soil core sampling | 8.5 | |||
| HOMESTEAD 36-Inch Soil Probe Rod with wide | underground locating | 8.0 |
XLUX Long Probe Plant Soil Moisture Meter: Best for potted trees
- Probe 5.5 in longer than regular styles
- Immediate dial reading
- Single probe
- Battery-free
The longer single probe reaches deeper soil while the large dial gives an immediate moisture reading. It suits spot checks in larger pots when you want a simple display.
Pros
- Immediate dial reading
- Single probe causes less damage to roots
- No batteries required
Cons
- Not for very hard soil or liquids
- Wipe clean and remove within 5 minutes
The XLUX Long Probe Plant Soil Moisture Meter is the best fit if you want a straightforward spot check without batteries. Its probe is 5.5 in longer than regular styles, and the large dial shows dry, moist or wet zones across 10 scales.
The single probe is designed to cause less damage to roots than double or multiple probes. Insert it into the soil, read the dial right away, and remove it after the check.
Don't leave the meter in soil for more than 5 minutes, and wipe the probe clean after use. XLUX cautions against very hard soil, liquids and loose, airy media where the probe may not contact moisture-holding particles.
Choose it for a simple reading near a tree or in a large planter. For a closer look at electronic displays and other formats, see our guide to best digital soil moisture meters.
XLUX 2 Pack Long Probe Plant Soil: Best for paired comparisons
- Two meters
- Probe 5.5 in longer than regular styles
- Immediate dial reading
- Battery-free
Two matching meters let you check separate points without moving one tool between them. Each has a single probe and an immediate dial reading.
Pros
- Two meters in the pack
- Longer probe for deeper soil
- Large dial with 10 scales
Cons
- Not for very hard soil or liquids
- Each probe needs cleaning after use
This XLUX two-pack suits a yard where you want to check two spots without carrying one meter back and forth. Both meters use a long single probe and show dry, moist or wet zones on a large dial.
Keep one near a young tree and the other near a mature tree, then compare readings at similar depths. Since the meters are battery-free, there is no power setup before taking a reading.
The same use limits apply: don't test liquids or very hard soil, remove the probe within 5 minutes, and wipe it clean. Choose this pack when comparing locations matters more than having a different display style.
Dr.meter 2 Pack Long Probe Soil Moisture: Best for color-coded checks
- Two meters
- Single probe
- Ten scales with red, green and blue zones
- No batteries required
This two-pack offers a color-coded scale for quick spot checks at separate locations. Its single-probe design is intended to limit soil disturbance.
Pros
- Two meters for separate locations
- Color-coded 10-scale display
- No batteries required
Cons
- Avoid rocks and extremely hard soil
- Not for liquids
The Dr.meter two-pack is a practical pick for comparing separate root zones with a color-coded dial. Each single-probe meter has 10 scales shown with red, green and blue zones.
The meters need no batteries, so you can take spot readings without charging or pairing. Avoid rocks and extremely hard soil, and clean each probe after use.
This model is useful when your main need is checking more than one location. If you prefer a straightforward analog dial, see our guide to best analog soil moisture meters.
Tennedriv Green Long Probe Soil Moisture Meter: Best for deep-rooted plants
- Long probe for deep use
- Large gauge
- No batteries required
- Wipe-clean probe
Tennedriv Green describes this meter's long probe as suited to deep-rooted plants. The large gauge keeps the reading visible during a spot check.
Pros
- Long probe for deeper root zones
- Large gauge
- No batteries required
Cons
- Remove it after taking a reading
- Not for testing water
Tennedriv Green describes this meter's long probe as suitable for deep-rooted plants. Its large gauge is easy to read, and it doesn't need batteries.
Use it as a spot-check tool: insert the probe in soil, read the gauge and wipe it with a paper towel or rag. Tennedriv Green cautions against leaving it in the soil or placing it in water.
Choose this option if you want a simple gauge for a deep-rooted plant. Skip it if you need a stated measurement depth or more display detail, since those features aren't specified here.
ECOWITT WH51L Soil Moisture Sensor with 1m/3.28ft: Best for remote deep readings
- 1 m / 3.28 ft PVC sensor wire
- Measures soil moisture up to almost 80 cm
- LCD shows real-time data
- Requires compatible ECOWITT gateway or console
The WH51L separates its sensor from the display with a 1 m wire, with a stated measurement depth up to almost 80 cm. Pair it with a compatible ECOWITT gateway or console to view transmitted readings.
Pros
- Wired sensor reaches deeper soil
- LCD displays real-time data
- Supports up to 8 channels with compatible systems
Cons
- Gateway or console sold separately
- Wireless signal can decline if the body sits too close to the soil
The ECOWITT WH51L is the pick for a sensor wire and remote data display. Its 1 m / 3.28 ft PVC wire supports measurements up to almost 80 cm, and the sensor's LCD shows real-time data.
To view readings through the ECOWITT app, you need a compatible Wi-Fi gateway; compatible display consoles are another option. Those devices are sold separately, so this setup suits you best if you already use the ECOWITT system or want to add one.
The sensor body should sit at least 20 cm above the soil surface for better RF transmission. Skip this sensor if you want a standalone tool for occasional checks, since it needs a compatible gateway or console for transmitted readings.
Dr.meter Long Probe Soil Moisture Meter Tester: Best for single-plant checks
- Single probe
- Ten scales with red, green and blue zones
- No batteries required
- For indoor and outdoor soil
This single meter suits occasional checks around a tree or garden bed. Its color-coded scale is easy to read without batteries.
Pros
- Single probe design
- Color-coded 10-scale display
- No batteries required
Cons
- Avoid rocks and extremely hard soil
- Not for liquids
This single Dr.meter is a straightforward choice for a one-location check. Its 10-scale color-coded display uses red, green and blue zones, and the single probe needs no batteries.
The probe is designed for soil, not liquids. Keep it away from rocks and very hard ground, then clean it after use to remove soil.
Choose this model when one meter is enough for the area you plan to check. If you want an automated setup that watches several spots, compare it with the best soil moisture sensor kits.
NexusLab Wireless Soil Moisture Meter with LCD: Best for multi-zone gardens
- Wireless sensors and LCD receiver
- Expandable up to 12 zones
- Measures moisture, temperature and light
- Batteries included
NexusLab pairs wireless sensors with an LCD receiver for tracking multiple garden zones. Its features focus on multi-zone monitoring rather than a long probe for deep tree roots.
Pros
- LCD receiver avoids the need for Wi-Fi or an app
- Expandable up to 12 zones
- Measures moisture, temperature and light
Cons
- The described sensor has three probes
- Not a dedicated deep-root long-probe meter
NexusLab is the multi-zone option for gardeners who want readings on an indoor LCD receiver. Its system can expand to 12 zones, and its sensors measure moisture, temperature and light.
NexusLab says its receiver works over RF without Wi-Fi, Bluetooth or an app, but walls and other obstacles may reduce the stated open-area range. The available information gives different counts for included wireless sensors, so confirm the included sensor count before buying.
Choose it for tracking several garden locations from one screen. Skip it if your main goal is to reach deep soil with a single long probe.
Varomorus Soil Sampler Probe 36" Stainless Steel: Best for soil core sampling
- 36 in stainless steel tubular probe
- Provides a soil core up to 12 in
- Footsteps for pushing
- T-style handle
This is a soil sampler, not a moisture meter. Its tubular probe collects a core for inspecting soil at depth around a tree.
Pros
- Collects a soil core
- Stainless steel construction
- Footstep supports pushing
Cons
- Does not give an electronic or dial moisture reading
- A core sample takes more effort than a spot check
The Varomorus tool is a sampler for collecting soil cores, not a meter that displays moisture. It has a 36 in stainless steel tube, a T-style handle and footsteps, and provides a core up to 12 in deep.
A soil core can help you inspect layers around a tree when a surface check doesn't answer your question. Push it into the ground using the footstep, then examine the soil sample.
Choose this tool when you need a physical sample for inspection. Skip it if you want a direct moisture reading without collecting and examining soil.
HOMESTEAD 36-Inch Soil Probe Rod with wide: Best for underground locating
- 36 in steel probe rod
- T-handle with rubber grip
- Spiked end
- Hand-powered
The long steel rod can help probe ground around trees, but it does not measure moisture. Choose it to locate underground objects or feel soil resistance, not as a substitute for a moisture meter.
Pros
- 36 in reach
- T-handle with rubber grip
- Hand-powered
Cons
- Does not display moisture readings
- Described for locating underground objects
The HOMESTEAD rod offers a 36 in steel shaft, a T-handle with rubber grip and a spiked end. It is described for probing ground and locating underground pipes or septic tanks, not for measuring soil moisture.
That distinction matters around trees: the rod may help you feel resistance as it enters the ground, but it has no moisture display. Use it for probing tasks it is designed to support.
Choose a dedicated moisture meter for watering decisions. If you mainly need to check soil across a yard, see our guide to best soil moisture meters for lawns.
How should you choose a long-probe soil moisture meter?
Choose by the depth and type of reading you need: a dial meter for a quick spot check, a wired sensor for remote readings, or a sampler for inspecting a soil core. A tool's physical length and its stated measurement depth can differ.
For a tree, start by deciding where in the root zone you need information. A long probe can reach below surface soil, but you should be able to insert it without hitting a root, stone or compacted patch.
Is a long-probe soil moisture meter right for tree roots?
A long-probe soil moisture meter can help you check below the surface near tree roots. For other outdoor growing situations, compare soil moisture meters for outdoor plants.
Look for a stated measurement depth when depth is the main reason you're buying.
The XLUX probe is 5.5 in longer than regular styles. ECOWITT states that the WH51L measures up to almost 80 cm, but transmitted readings need a compatible gateway or console.
Think about the soil as well as the tree. The XLUX is designed for standard potting soil, and loose or airy media may leave too little contact between the probe and moisture-holding particles.
Should you choose an analog or digital meter?
An analog meter suits occasional checks because it gives a local dial reading without batteries on these picks. A digital or wireless option fits better when you want a separate screen or to monitor more than one location.
Some products described as “digital” are sensors in a larger system, rather than standalone meters. Check whether you need a gateway, console or receiver before choosing that route.
If you also need soil pH information, compare our guide to best soil pH and moisture meters. A moisture-only meter doesn't provide a pH reading.
When does a two-pack help?
A two-pack is useful when you want to compare separate areas with less back-and-forth. Keep your comparisons fair by taking readings at similar depths and in similar soil.
The XLUX and Dr.meter two-packs both have two battery-free, single-probe meters. Choose XLUX for its described longer probe and large dial; choose Dr.meter if the red, green and blue scale is the feature you want.
What should you skip?
Skip a basic dial meter if you need continuous readings sent to a screen. Choose a compatible sensor system for remote data, and account for its setup requirements before buying.
Skip a soil sampler or probing rod if the goal is a displayed moisture reading. The Varomorus tool collects soil cores, while the HOMESTEAD rod is described for probing and locating underground objects.
How do you set up and use a long probe around a tree?
Use a long-probe meter for brief spot checks: choose a suitable point, insert the probe gently, read the display, then remove and clean it. Avoid forcing a probe through resistance.
Start at a point away from the trunk and choose more than one location around the tree if you want to compare conditions. Soil can differ from one side to another, so keep the insertion depth and general placement similar each time.
For a dial meter, read the gauge promptly after insertion. Don't leave the XLUX in soil longer than 5 minutes, and don't leave the Tennedriv meter in the soil.
Clean the probe after each reading with a suitable cloth. XLUX and Dr.meter both advise cleaning after use, and Tennedriv Green suggests wiping with a paper towel or rag.
For ECOWITT, plan the system before placing the sensor. Pair it with a compatible gateway or console, and keep the sensor body at least 20 cm above the soil surface to support RF transmission.
What mistakes lead to confusing readings?
The most common mistakes are choosing a tool that doesn't measure moisture, inserting a probe into unsuitable soil, or comparing readings from different depths. Use a dedicated moisture meter for a direct moisture reading.
Don't use these soil meters in water or other liquids. Avoid very hard or rocky soil, since it can block the probe or damage it.
Loose, airy media can also cause trouble for the XLUX meter. If the probe doesn't make contact with moisture-holding particles, its reading may stay in the dry zone or vary; firm the media around the probe so it contacts the soil.
A single reading is only a snapshot at one point. If you need to compare parts of a tree's root area, take several readings in a consistent way instead of treating one spot as representative of the whole area.
Which long-probe soil meter should you choose?
Choose the XLUX single meter for a simple, immediate reading in a pot or near a tree. Pick an XLUX or Dr.meter two-pack to compare locations, and choose ECOWITT when you want a wired sensor with remote display through a compatible system.
Use Varomorus when you want a soil core to inspect, and HOMESTEAD when the task is probing or locating underground objects. Neither tool replaces a moisture meter.
For most people searching for the best soil moisture meter long probe, the XLUX single meter is the clearest starting point: it reads immediately and needs no batteries. Choose ECOWITT instead when its deeper stated measurement range and system-based display match your garden setup.
Our top 3 picks at a glance
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1
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2
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3
Best for color-coded checks
Dr.meter 2 Pack Long Probe Soil Moisture
9.5/10 our score
See it on Amazon
Frequently asked questions
How long should a soil moisture probe be for trees?
Choose a probe that reaches the part of the root zone you want to check. A longer probe can sample below the surface, but the listed length may not equal the depth it can measure.
For example, ECOWITT gives a stated measurement depth of almost 80 cm, while the XLUX meter describes a probe 5.5 in longer than regular styles.
Can a long-probe moisture meter damage tree roots?
Any probe can meet roots, so insert it carefully and avoid forcing it through resistance. Single-probe meters are designed to cause less damage than multiple-probe styles, but they still need a clear path into soil.
Don't push a meter into rocks or very hard ground.
Are wireless soil sensors better for trees?
Wireless sensors suit ongoing checks when you want readings on a separate receiver or app. The ECOWITT WH51L uses a 1 m wire and needs a compatible gateway or console to transmit readings.
For an occasional spot check, a battery-free dial meter is simpler to set up.
Can a soil sampler measure moisture?
A soil sampler collects a core so you can inspect soil at depth, but it doesn't provide a moisture reading by itself. Use a dedicated moisture meter if you want a dial or electronic reading.
A sampler can help when you need to see soil structure or compare layers around a tree.
