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  • Welcome
    • What is the Grow Sensor?
    • What does the Grow Sensor measure?
  • Getting started
    • How do I onboard my Grow Sensor?
      • Do I need to charge my Grow Sensor when it arrives?
      • How do I connect my Grow Sensor to my Wi-Fi network?
      • How quickly will I see graph data in the app after onboarding?
    • How do I hang my Grow Sensor in my environment?
    • How do I set up my leaf temperature sensor?
    • How do I charge my Grow Sensor?
    • How do I use the Grow Sensor App?
  • The Grow Sensor
    • What does the Grow Sensor’s button do?
    • How accurate is the Grow Sensor?
    • How do I calibrate the Grow Sensor?
      • Does the Grow Sensor come pre-calibrated?
      • How do I calibrate the humidity sensor?
      • How do I calibrate the CO2 sensor?
      • Do I need to calibrate any other sensors?
      • Can I set offsets to help with calibration?
    • Can the Grow Sensor be used outside?
    • How many Grow Sensors do I need for my growing space?
    • What is the Wi-Fi range of the Grow Sensor?
    • How long does the Grow Sensor battery last?
    • How to set up the Grow Sensor to measure leaf temperature?
    • How to find your device / Grow Sensor ID?
    • Does the Grow Sensor log data offline?
    • Will the sensor inform me if the Wi-Fi connection fails?
    • Why does the Grow Sensor’s LED flash green periodically?
    • Why is the Grow Sensor light flashing red when onboarding?
  • The Grow App
    • How do I use the Grow dashboard?
      • How alerts are displayed?
      • What are grows?
      • How to use dashboard trends?
      • Can I rename a grow?
      • How do I close and start a new grow?
    • How do I use the Grow graphs?
      • What graphs/data can I see?
      • How do I interact with graphs?
      • How often does the graph data update?
      • Can I filter graphs?
      • When does the eDLI (Daily Light Integral) graph reset?
      • How do I use the light spectrum graph in the app?
      • What is leaf VPD, and can I see this in the graphs?
    • How do I set my grow’s night and day photoperiods?
    • How do I set limits and alerts for graphs?
      • How do I set high/low and dangerously high/low limits?
      • Can I create limit templates or recipes?
      • How do I activate push notifications?
      • If you’re not receiving notifications
      • What limits can I set?
      • How do I set lights on and lights of alerts?
      • How does the eDLI limit work?
      • How does the dew point limit work?
  • Substrate probes
    • Can I plug a substrate probe directly into the Grow Sensor?
    • What soil probes are compatible with the Grow Sensor?
    • Which sensors should I purchase?
    • What do the substrate probes measure?
    • Can I change my substrate type in the Grow App?
    • How many substrate probes can I use with the Grow Sensor?
    • How do I position my soil probe for my pot size?
      • How do I place the probe through the pot
      • How do I place the sensor in the pot?
      • *To do* Grow SUB (TBC)
      • Delta-T Wet 150
      • Meter group Teros 12
      • Acclima TDR-310W
      • Acclima TDR-315N
      • The Grow Link Terra Link
    • My VWC reading is too low or high, help!
  • App settings
    • How can I change my account email?
    • How can I change my account password?
    • How can I change the measurement units in the app?
    • How do I access the API?
    • Do you have team Grow account access?
    • How can I opt in to test latest beta software and updates?
  • Making a purchase
    • What are my payment options?
    • Do you offer financing or instalment payment options?
    • Is my payment information secure?
    • Can I split my payment between multiple methods?
    • Do you offer any discounts or promotions on the Grow Sensor?
    • Can I cancel or change an order?
    • How can I be notified when the Grow Sensor is back in stock?
    • Are there any quantity limits for purchasing the Grow Sensor?
  • Returns and refunds
    • Do you have a warranty?
    • Do you have a satisfaction guarantee?
    • Do you have a returns and refund policy?
    • What are the returns conditions?
    • Can I return a Grow Sensor that has been opened or used?
    • What do I need to include when returning the Grow Sensor?
    • What should I do if I receive a damaged or defective Grow Sensor?
      • Do I need to provide evidence of the damage when requesting a return?
    • Can I return or exchange a damaged or defective Grow Sensor?
    • Will the shipping costs be refunded?
    • Will I be reimbursed for shipping if I return a damaged or defective Grow Sensor?
    • Does it cost to make a return?
    • Do I need to pay for shipping when sending back a return?
    • How can I return the Grow Sensor?
    • When will I receive my refund?
    • What can’t I return?
  • Shipping and delivery
    • Do you have a shipping policy?
    • Do you offer international shipping?
    • How long do you ship after I place my order?
    • What are your shipping options?
    • What are your shipping rates?
    • Do you offer express shipping options?
    • How can I track my order?
    • How will I receive shipping updates?
    • How long does delivery take?
    • Can I specify a delivery date or time for my order?
    • Can I change my shipping address after placing the order?
    • Can I reroute my package to a different address if I'm not available to receive it?
    • What happens if I miss the delivery attempt?
    • Tracking says the order has been delivered, but haven’t received it - what do I do?
    • What happens if my package gets damaged during shipping?
    • What should I do if my order hasn't arrived within the expected timeframe?
    • Can I combine multiple orders to save on shipping costs?
    • Do you provide free shipping on orders over a certain amount?
    • Do you offer local pickup as an option?
    • Do you offer signature confirmation upon delivery?
  • Customer support
    • How can I reach the Grow Sensor customer support team?
    • What are Grow Sensor’s customer support hours?
    • How long does it take to receive a response to my inquiry?
    • Can I schedule a phone call or appointment with a Grow representative?
    • What support does Grow Sensor offer for professional growers?
    • What kind of customer support does Grow Sensor provide for troubleshooting?
    • How can I unsubscribe from your mailing list?
    • Can I sign up for a newsletter or email subscription for updates and offers?
    • Can I provide feedback or make a complaint?
    • How can I leave a review?
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On this page
  • Best practices for inserting a soil probe
  • Why should the entire sensor stay inside the pot?
  • Key reasons to keep the sensor inside the pot:
  • Substrate-specific considerations

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  1. Substrate probes

How do I position my soil probe for my pot size?

Properly setting up your substrate sensor is essential for accurate and repeatable readings.

PreviousHow many substrate probes can I use with the Grow Sensor?NextHow do I place the probe through the pot

Last updated 2 months ago

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Incorrect placement can lead to misleading moisture, EC, and temperature data, affecting your ability to make informed irrigation and feeding decisions.

Best practices for inserting a soil probe

1

Keep prongs straight and level

  • Always insert the prongs horizontally into the pot, not at an angle.

  • Angled placement causes inconsistent depth readings, as the tip of the probe will be lower than the entry point.

  • Multi-prong probes should be parallel to the soil surface, never inserted vertically, since moisture, EC, and temperature vary by depth.

2

Correct sensor height for reliable readings

Some probes are calibrated for specific insertion heights to measure conditions in the active root zone. Incorrect height placement can cause misleading data.

  • Too high in the pot – Measures topsoil, which dries out faster than deeper layers.

  • Too low down in the pot – Captures moisture and nutrients that may not be available to the plant’s roots.

3

Fully insert the sensor – No exposed prong

  • Any part of the probe exposed to air will skew readings, particularly for moisture and EC.

  • If moisture and EC appear lower than expected, check that the entire probe is in contact with the substrate.

4

Do not remove the sensor once placed

  • Reinserting a sensor disrupts the substrate, causing air pockets that affect permittivity and moisture and EC readings.

  • Leave the sensor in place for long-term, consistent monitoring.

5

Minimise air gaps around the probe

  • Air pockets alter permittivity, which affects moisture and EC readings.

  • If the sensor is not inserted firmly, gaps may form, misleading the device into reading lower moisture levels.

  • After inserting the probe, gently press the substrate around it to ensure good contact (if possible)

Why should the entire sensor stay inside the pot?

For the most accurate readings, the sensor body should remain inside the pot to reflect the actual environmental conditions affecting the plant’s roots. If any part of the sensor is exposed, external factors can distort data.

Key reasons to keep the sensor inside the pot:

  1. Consistent temperature readings – A sensor partially exposed to air may measure room temperature instead of substrate temperature, leading to inaccurate root zone data.

  2. Accurate moisture and EC measurements – Exposed prongs may pick up dry air readings, making the substrate appear drier or lower in EC than it actually is.

  3. Prevents external interference – Factors like air circulation, lighting, and nearby equipment can distort readings if the sensor is left outside the pot.

  4. Stable data over time – Keeping the sensor fully inserted ensures consistent, repeatable data for better decision-making.

Substrate-specific considerations

Some substrates, like rockwool, are pre-formed and not designed for probe insertion. In these cases, placing the probe into the substrate is your only option.

By following these best practices, you’ll ensure reliable, real-time substrate data, helping you optimise your watering and feeding strategy for better plant health and higher yields.

*To do* Grow SUB (TBC)
Delta-T Wet 150
Meter group Teros 12
Acclima TDR-310W
Acclima TDR-315N
The Grow Link Terra Link