Garden King Digital Hygrometer - Min/Max Temperature & Humidity Meter

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£2.95

The Garden King Digital Hygrometer Without Probe is a simple and effective temperature and humidity monitor for grow rooms, grow tents, propagation areas, greenhouses and other controlled growing environments.

Temperature and relative humidity are two of the most important environmental measurements for indoor growers. This compact digital thermo-hygrometer displays both, giving you an immediate overview of conditions around your plants without requiring separate instruments.

In addition to current readings, the Garden King Hygrometer records minimum and maximum temperature and humidity. This is particularly useful in grow rooms because conditions can change significantly while the grower is away, during the dark period or as ventilation and heating equipment cycles.

This version is the without-probe model, so measurements are taken at the position of the main unit. This makes it a straightforward choice for monitoring general room or grow-tent conditions.

Why choose the Garden King Digital Hygrometer?

  • Temperature monitoring - quickly check the temperature within your growing environment.
  • Humidity monitoring - displays relative humidity alongside temperature.
  • Minimum temperature memory - see how cool the environment became while you were away.
  • Maximum temperature memory - identify temperature peaks that might otherwise go unnoticed.
  • Min/max humidity memory - useful for identifying excessive humidity or unexpectedly dry conditions.
  • Large digital display - readings can be checked quickly without interpreting an analogue dial.
  • No remote probe - simple all-in-one design for measuring conditions at the unit's position.
  • Compact design - easy to position inside grow tents, grow rooms and propagation areas.
  • Useful day and night monitoring - min/max memory helps reveal environmental changes between checks.
  • Simple environmental monitoring - ideal for growers who need reliable basic information without a complicated control system.

Monitor temperature & humidity together

Temperature and humidity are closely linked. As temperature changes, relative humidity can also change significantly, which is why monitoring both measurements together gives a much better picture of the growing environment than using a thermometer alone.

High temperatures can increase plant water demand, while excessively high humidity can reduce transpiration and encourage condensation. Very dry air can increase moisture loss from plants, particularly during propagation and early establishment.

A digital thermo-hygrometer gives growers the information needed to make informed adjustments to extraction, circulation, heating, humidification or dehumidification equipment.

Why min/max memory matters

A single current reading only tells you what the environment is doing at that particular moment. The minimum and maximum memory function provides additional information about what happened between checks.

For example, a grow room may appear perfectly comfortable when checked during the day but become considerably cooler and more humid after the lights switch off. Alternatively, temperatures may peak during the warmest part of the lighting period while nobody is present.

Reviewing the recorded minimum and maximum values makes these fluctuations much easier to identify.

Where should I position a grow room hygrometer?

For general crop monitoring, position the Garden King Hygrometer in a representative part of the growing environment, ideally around plant canopy height.

Avoid placing the unit directly in front of an intake fan, immediately beside a humidifier or dehumidifier, directly beneath intense lighting or against a particularly hot or cold surface. These locations can produce readings that do not accurately represent conditions experienced by the majority of the crop.

In larger rooms, environmental conditions may vary considerably from one area to another. Using more than one hygrometer can help identify warmer, cooler, wetter or drier zones.

With probe or without probe?

Garden King offers versions of its digital min/max thermo-hygrometer with and without an external probe. This product is the without-probe version.

Without Probe Simple all-in-one monitoring of temperature and humidity at the location of the main display unit.
With Probe Adds an external temperature probe, useful where temperature needs to be measured at a separate position from the main display.

If you simply need to monitor general grow-room or grow-tent temperature and humidity, the probe-free model provides a straightforward and economical solution.

Ideal for grow rooms & grow tents

Environmental monitoring is one of the simplest ways to improve consistency in an indoor growing setup. Without temperature and humidity measurements, ventilation and climate adjustments are largely guesswork.

The Garden King Hygrometer provides an inexpensive way to monitor both values continuously. Checking the display and reviewing minimum and maximum readings regularly can help identify environmental problems before they become persistent.

It can be used alongside extraction fans, circulation fans, heaters, humidifiers and dehumidifiers to help assess whether environmental equipment is achieving the intended conditions.

Useful from propagation through to mature plants

Temperature and humidity remain important throughout the growing cycle, although the preferred environment can change as plants develop.

Young plants and cuttings generally require closer attention to moisture loss, while mature crops can produce considerable amounts of water vapour through transpiration. Monitoring relative humidity becomes particularly useful as plant density and canopy size increase.

Because the Garden King unit displays both temperature and humidity, the same monitor can remain useful throughout different stages of plant development.

Garden King Digital Hygrometer product details

Brand Garden King
Product Digital Min/Max Hygrometer Without Probe
Product type Digital thermometer & hygrometer
Temperature monitoring Yes
Relative humidity monitoring Yes
Minimum memory Yes
Maximum memory Yes
Display Digital LCD
External probe No
Suitable environments Grow rooms, grow tents, propagation areas, greenhouses & other controlled growing environments
Outer case quantity 25 units

Garden King Digital Hygrometer FAQs

What does the Garden King Hygrometer measure?

It monitors both temperature and relative humidity, allowing the two main grow-room climate measurements to be checked from a single digital display.

Does this Garden King Hygrometer have a probe?

No. This is the without-probe version, so environmental measurements are taken at the position of the main unit.

Does it record minimum and maximum readings?

Yes. The unit records minimum and maximum values, making it easier to identify environmental changes that occur between checks.

Why do I need a hygrometer in a grow room?

A hygrometer allows you to monitor relative humidity rather than estimating it. This helps when adjusting ventilation, heating, humidification and dehumidification equipment.

Where should I put the hygrometer in a grow tent?

For general crop monitoring, position it around canopy height in a location that represents the wider growing environment rather than directly beside environmental equipment.

Should I put the hygrometer next to my intake fan?

Usually not. Air directly entering the grow space may be warmer, cooler, wetter or drier than the general room environment and can therefore distort the reading.

Why are minimum and maximum temperature readings useful?

They can reveal temperature peaks and overnight lows that may occur while the grow room is unattended.

Why are minimum and maximum humidity readings useful?

They help identify periods of unexpectedly high or low relative humidity, including changes that occur when lighting, extraction or heating cycles change.

Can I use this hygrometer in a greenhouse?

It can be used to monitor suitable indoor and protected growing environments, provided the unit is kept within the conditions specified for the product and protected from direct water exposure.

Can I use more than one hygrometer in a grow room?

Yes. Multiple monitors can be useful in larger environments because temperature and humidity may differ between different parts of the room.

Does a hygrometer control humidity?

No. A hygrometer measures humidity. Equipment such as extraction fans, humidifiers and dehumidifiers is used to change the environment.

What is the difference between a thermometer and a hygrometer?

A thermometer measures temperature, while a hygrometer measures relative humidity. This Garden King unit combines both measurements in one display.

Is this suitable for propagation?

Yes. Monitoring temperature and humidity is particularly useful during propagation and early plant establishment, when environmental conditions can have a significant effect on moisture loss.

How many Garden King Hygrometers are in an outer case?

An outer case contains 25 units.

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£2.95