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This ETI Therma-Hygrometer is a digital monitor with Max/Min record and a frost alarm (0°C). Its 3m remote probe measures temperature and RH accurately in the grow room, providing vital data for environmental control and protecting hydroponic crops.
Achieve high-precision environmental control in your grow room or greenhouse with the ETI Therma-Hygrometer featuring Max/Min & Alarm Functions. This professional-grade digital monitor simultaneously displays both temperature (°C/°F) and Relative Humidity (%rh), giving you the detailed data required for optimal plant growth and disease prevention. Proper monitoring of these two factors is one of the 5 Essential Tips for Setting Up a Hydroponics Grow Room.
What sets this unit apart is its dual-sensor capability: an internal sensor monitors the local environment (0 to 49.9°C), while the 3-metre water-resistant remote probe extends the temperature range significantly (to -49.9 to 69.9°C), allowing you to precisely measure conditions at the plant canopy or root zone. Crucially, the audible temperature alert alarm sounds if the external probe detects 0°C or below, acting as an ideal frost alert to trigger immediate action, such as engaging a Heater or Heat Mat, thereby protecting your valuable crops.
The Max/Min record function is perfect for tracking environmental fluctuations throughout the day, helping you manage spikes in heat or humidity. If you record high maximum humidity readings, you know it is time to adjust your Dehumidifier or Extraction Fan to prevent mould and mildew outbreaks.
Key Benefits of the ETI Therma-Hygrometer with Max/Min & Alarm
- Dual Sensor Monitoring: Simultaneously measures internal temperature (room/unit level) and external temperature via a 3-metre remote probe, providing accurate readings at both the plant level and ambient air.
- Max/Min Record Function: Automatically records the highest (Max) and lowest (Min) temperature and humidity readings over a period, allowing you to track environmental fluctuations and identify stress points in your grow cycle.
- Essential Frost Alert: Features a dedicated, audible temperature alarm that sounds if the external probe hits 0°C or below, providing immediate notification to protect sensitive plants from freeze damage.
- High Accuracy & Wide Range: Offers precision temperature measurement from -49.9 to 69.9°C and humidity measurement from 20 to 99%rh, essential for every stage of hydroponics and propagation.
- Portable and Versatile: Housed in a compact, durable ABS case with both a foldaway stand and a keyhole slot for easy wall mounting within a grow tent or chamber.
Frequently Asked Questions
Why do I need both Max/Min readings and an Alarm function?
The Max/Min function allows you to see the environmental extremes that occurred while you were away, such as sudden drops in temperature overnight or high humidity spikes, which are crucial factors for preventing mould. The Alarm function provides immediate, real-time warning of critical low temperatures, which is essential for activating a heater and protecting tender seedlings or crops from frost or cold stress.Where should I place the remote temperature probe for the most accurate readings?
The 3-metre remote probe should be placed directly within the plant canopy or inserted into the rooting medium (e.g., rockwool or coco coir) to monitor the temperature at the root zone. This ensures you are measuring the actual temperature experienced by the plant, which is the most critical factor for seed germination and nutrient uptake.Can I use the alarm function for high temperature or high humidity alerts?
The primary temperature alarm is fixed as a frost alert (0°C or below). While this model does not have user-programmable high alarms for temperature or humidity, the Max/Min function is the best way to monitor high spikes and manually adjust your ventilation or dehumidifier settings to stay within the safe range.How often should I reset the Max/Min function?
You should typically reset the Max/Min readings daily. This allows you to log the highest and lowest temperature and humidity extremes that occurred during the last 24-hour light cycle (lights on and lights off), providing a reliable gauge for necessary adjustments to your climate control system.SKU: 1036- Case material: ABS plastic
Display type: LCD digital
Probe/sensor style: internal sensor & one external with connector
Power source: battery powered (1x AAA, included)
Warranty: one year
Measurement scale: Celsius/Fahrenheit & %rh
Max/min function: yes
Alarm: audible alarm
Dimensions: 20 x 65 x 97mm
Weight: 100 grams Free delivery on orders over £60*
- UK Mainland onlyStandard Delivery £4.95
- Heavy / Large item surcharge £2 per item
- 1-3 Days**
- UK Mainland onlyExpress Delivery £8.95*
- Next Working Day**
- UK Mainland onlyScottish Highlands £15.95*
- 2-5 Days***Can not be used with Heavy / Large items
**If ordered on a working day before 2pm cut off (Saturday and Sunday are not classed as working days).Please See Delivery and Returns page for more details.