How To Use The Zamnesia Hygrometer/Thermometer

How To Use The Zamnesia Hygrometer/Thermometer

Adam Parsons
Adam Parsons
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A hygrometer and thermometer are an essential part of any serious grower's kit. Getting a good final yield from a mushroom grow (or any other kind of grow) is not a matter of chance. Knowing their conditions, and manipulating them to be optimal for growth and quality is key to being a good cultivator. Fortunately, measuring temperature and humidity is neither difficult nor expensive. With the easy-to-use Zamnesia hygrometer/thermometer, you can measure the conditions of your grow and get the best possible results.

What Does A Hygrometer/Thermometer Measure?

A hygrometer measures humidity—water content held in the air. A thermometer, a more well known tool, measures temperature—in the case of growing plants, often air temperature.

Knowing both of these metrics is essential to successfully growing magic mushrooms. Growing mushrooms requries a stable and high humidity of around 90%. Depending on the stage of magic mushroom development, a temperature range of 18 – 28℃ is also required. Mushrooms can't just be left in whatever conditions your house and the weather dictate if you want to maximise your yields.

Knowledge is power, and without monitoring these variables, you are leaving a lot up to chance.

However, it's not just mushrooms which benefits from stable, controlled environments. More or less anything that grows has optimal conditions. For instance, salvia requires a humid environment that gradually reduces over weeks to the ambient humidity. Likewise, chilli peppers and kanna have optimum conditions within which they thrive.

And cannabis! Cannabis requires a variety of humidities and temperatures throughout its lifecycle. When you spend months on a grow, you may as well invest in this small and inexpensive tool to get the very most out of your efforts. When using a grow tent, it's important not to allow it to get too hot or too humid. This can stress your plants, and increase the likelihood of things such as bud rot.

So if you were in any doubt, you can be sure that a hygrometer/thermometer is a worthy investment.

Information About The Zamnesia Hygrometer/Thermometer

Information About The Zamnesia Hygrometer/Thermometer

For such a helpful little gadget, the Zamnesia hygrometer/thermometer is simple to use.

The display shows three things:

  1. The temperature
  2. Humidity
  3. Whether its set to read indoor or outdoor conditions

As for control, there are three buttons which allow you to:

  • Change between Celsius and Fahrenheit
  • Check the maximum and minimum temp/humidity within the last 24 hours
  • Change it from inside the grow space to outside

The display and controls are attached to the probes via a long wire. This means that you can observe the conditions and change the controls from outside your grow setup, minimising your need to interfere in the space. The probes can be attached to almost any kind of surface with two suction cups.

For further instructions on specific usage, read below.

Related article

Humidity In The Cannabis Grow Space


  • Temperature range of internal sensor: -10 to 50°C (14 to 122°F)
  • Temperature range of grow bag sensor: -50 to 70°C (-58 to 158°F)
  • Humidity range of grow bag sensor: 10 to 95% RH
  • Sampling time: 10 seconds
  • Accuracy: ±1°C and ±5% RH
  • Power: 1pc 1.5V AAA (Included. Please remove plastic seal before use.)

How To Use The Zamnesia Hygrometer/Thermometer

How To Use The Zamnesia Hygrometer/Thermometer

The Zamnesia hygrometer/thermometer is ready to use in a few simple steps.

  • Depending on what you're growing, identify the best place for you meter to go. With mushroom grows, this is at about the height of a mature mushroom. With cannabis, it's a little more complicated. Conditions can vary a lot, even with ventilation. Ideally, around 3 meters should be used – one at the top, middle and bottom of the grow space. Otherwise, consider rotating 1 around the space.

  • Once you've identified a suitable space, you can attach the probes to a nearby surface (or something which can be moved around the space) using the attached suction cups.

  • Now place the display somewhere where you can easily access it without disturbing the grow.

  • Neither the humidity nor temperature probe are totally waterproof. Therefore it's important to avoid direct contact with water.


As you can see, this small and easy-to-use hygrometer/thermometer can drastically improve the control you have over your grow. For plants and fungi particularly, temperature and humidity play a crucial role in their development, and optimising their conditions ultimately optimises the quality and size of your final yield.

Adam Parsons
Adam Parsons
Professional cannabis journalist, copywriter, and author Adam Parsons is a long-time staff member of Zamnesia. Tasked with covering a wide range of topics from CBD to psychedelics and everything in between, Adam creates blog posts, guides, and explores an ever-growing range of products.
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