Best Thermo-Hygrometers

The Best Thermo-Hygrometers

Today we look at the some of the best Thermo-Hygrometers out there on the market, but first we should take a little time to understand what a Thermo-Hygrometer is and why we need them.

Thermo-Hygrometers are used to measure the temperature and moisture content (humidity) of the surrounding air. Many of them have large digital displays to enable us to see all the information we need. So before we look at the best Thermo-Hygrometers it is also important to understand the effects that air temperature and humidity can have on plants, so here’s a quick science lesson.

Everything in an environment affects how a plant grows, thrives and reproduces. When growing plants outside of an environment in which they naturally thrive, climate control for plant growth is essential to maximize the photosynthetic process. By maintaining optimal relative humidity levels in a greenhouse and other growing environments, you ensure optimal plant transpiration. 

The Affects of Humidity on Plants

Relative humidity is the amount of water vapour in the air relative to the maximum amount of water vapour that the air can hold at a certain temperature. If the relative humidity level is 75 percent at 80° F, this means that every kilogram of the air in the respective space contains 75 percent of the maximum amount of water that it can hold for the given temperature.

Relative humidity levels affect when and how plants transpire, or “breathe.” When the weather is warm, a plant may close its stomata to reduce water losses. The stomata also act as a cooling mechanism. When ambient conditions are too warm for a plant it makes it difficult for the plant to ‘breathe’ properly.

As plants transpire, the humidity around saturates leaves with water vapour. When relative humidity levels are too high or there is a lack of air circulation, a plant cannot make water evaporate (part of the transpiration process) or draw nutrients from the soil. When this occurs for a prolonged period, a plant eventually rots.

The Importance of Climate Control for Plant Growth and Why The Best Thermo-Hygrometers Can Help

As seedlings grow or when a grower propagates plants from leaf or stem cuttings, the young or collected plants automatically try to prevent water loss. To support cuttings and young plants, growers often uses plastic tents or propagation chambers that increase relative humidity levels surrounding the leaves and ensure proper air circulation.

In addition to water and air, plants use light energy for the transpiration process, as it causes liquid water to turn to vapour (evaporation). Greenhouses often maintain relative humidity levels below threshold values during the day and night by controlling the water content in air to maintain a minimum transpiration rate in plants.

When conditions are too humid, it may promote the growth of mould and bacteria that cause plants to die and crops to fail, as well as conditions like root or crown rot. Humid conditions also invite the presence of pests, such as fungus gnats, whose larva feed on plant roots and thrive in moist soil.

Managing the growth and development of plants involves manipulating a growing environment so light, temperature and relative humidity levels to promote photosynthesis, high yields and generative growth. Optimal transpiration rates vary by plant type, age and season, making climate control for plant growth necessary.

Now we know why we need a one, lets have a look at three of the best thermo-hygrometers on the market today:

ThermoPro TP50NEW Large LCD Digital Thermo-Hygrometer

ThermoPro TP55 Digital Thermo-hygrometer with Larger Backlit Display

EARME Wireless Digital Temperature Monitor Thermo-hygrometer