THERMO Thermometer/Hygrometer

THERMO Thermometer/Hygrometer – Digital Temperature & Humidity Sensor with 1.5m Probe

Keep your grow room environment perfectly balanced with the THERMO Thermometer/Hygrometer, designed for hydroponic growers who need accurate environmental readings at a glance. 🌡️🌿

With a large digital display and 1.5m probe cable, you can monitor temperature and humidity exactly where it matters most — at plant canopy height. This helps growers maintain ideal conditions for plant health, nutrient uptake, and disease prevention.

Perfect for grow tents, hydroponic systems, greenhouses, and sheltered indoor growing spaces, this simple but essential tool helps you track the environmental factors that directly impact plant growth and yield.

Key Features 🌡️📊

• 📊 Large Digital Display – Clearly shows real-time temperature and humidity readings

• 🌿 1.5m Sensor Probe Cable – Position the sensor at plant canopy height for accurate environmental monitoring

• 🌧️ Indoor & Greenhouse Suitable – Ideal for hydroponic grow rooms, tents, and protected outdoor setups

• 📏 VPD Friendly Monitoring – Track temperature and humidity to assist with calculating Vapour Pressure Deficit (VPD)

• 🔋 Battery Powered – Operates on 1 × AAA battery (not included)

📌 Pro Tip: Hang the probe at plant canopy height for the most accurate environmental readings in your grow space.

Why Use a Hygrometer in Hydroponics? 🌱💧

Monitoring humidity is essential for maintaining a stable hydroponic environment. A hygrometer allows growers to track relative humidity (RH) in real time so they can optimise plant health and prevent common grow room problems.

Key benefits include:

• 🌿 Optimised Transpiration & Nutrient Uptake
  Humidity controls how quickly plants transpire, which directly affects nutrient absorption from the root zone.

• 🦠 Disease Prevention
  High humidity combined with poor airflow can create conditions for mould, powdery mildew, and rot.

• 🌱 Growth Stage Control
  Different stages of plant growth require different humidity levels for best results.

• 📊 VPD Monitoring
  Temperature and humidity data can be used to calculate Vapour Pressure Deficit (VPD), helping growers fine-tune their environment for healthier plants and better yields.

Recommended Humidity Ranges for Hydroponic Growing 🌿

• 🌱 Seedlings & Clones: 60–70% RH

• 🌿 Vegetative Stage: 50–60% RH

• 🌸 Flowering Stage: 40–50% RH

Maintaining the correct humidity range helps prevent plant stress, improves nutrient uptake, and reduces the risk of fungal disease.

Please choose your products carefully, as A-Grade Hydroponics reserves the right not to accept returns based on either an incorrect choice or a change of mind.

However, we love happy customers so contact us with your query and we will do our best to accommodate you. If you have queries about a product you would like to purchase, please contact us to discuss your concerns before you buy.

A-Grade Hydroponics will honour all manufacturers warranties subject to the terms and conditions of those manufacturers. However warranty does not cover abuse, neglect, improper care, loss or damage from incorrect usage.

Warranty claims will be processed at A-Grade Hydroponics' discretion as a refund, repair or replacement. If products need to be returned to us for warranty purposes e-mail us at grow@agradehydroponics.com with the receipt/invoice number, date of purchase and a brief description of the fault (including photographs where possible). We will then issue you with a product return number.

All returns should be in original packaging and have the receipt/invoice number, date of purchase, and product return number enclosed. The product return number should also be written on the outside of the package for easy identification purposes.

A-Grade Hydroponics has a strict 'no returns' or refunds policy for liquid products, like nutrients, additives, gels, calibration fluids etc, so please choose these items carefully.

*All orders are dispatched in unmarked boxes to maintain your privacy.*

DISPATCH AND DELIVERY

Orders are shipped via Australia Post or shipping platform Big Post. Orders are generally dispatched on Tuesday, Wednesday and Friday. Please allow for additional delivery time for remote areas. If you require express delivery, please contact our sales representatives at 03 9555 6667 or email grow@agradehydroponics.com to obtain a quote. 

Couriers will attempt delivery to the specified address. If no one is home to receive the delivery, the couriers will leave your parcel somewhere safe. If there is no safe place, re-delivery or collection will be offered by the carrier.

Due to the increasing frequency of online fraud and theft, we are unable to ship to P.O. Boxes and Parcel Lockers.

SHIPPING COSTS

All freight charges are calculated on weight, dimensions and location. We are committed to keeping shipping charges at a minimum and do not charge handling fees.

Please note: Freight costs are subject to change. Regional areas, large and bulky orders, and tail-lift delivery occasionally incur an additional levy. Should shipping costs need to be amended it will be to reflect the actual charges, and not incur additional ‘shipping and handling’ fees. We will notify you if this rare situation occurs.

A-Grade Hydroponics reserves the right to cancel the order if shipping costs become prohibitive and customers will be issued a full refund.

PAYMENT

All payments must be cleared before dispatch. Payments can be made online via PayPal, AfterPay, PayID or Electronic Funds Transfer. Payments can also be accepted via credit card by phoning 03 9555 6667.

Please allow at least 24 hours for payments to clear.

FULFILMENT OF ORDERS

You will be notified immediately if an item is permanently unavailable, with options for a replacement item at equal or higher value, refund or store credit.

All refunds will clear within 3-5 business days. Store Credits will be issued as an electronic Gift Card to be used online or in-store.

DANGEROUS AND PROHIBITED GOODS

These goods are available for in-store collection only.