Comparison Assistant AH-1992 vs TFA Multy

— Number of sensors. The total number of sensors that can be linked to the weather station and send measurements to it. The presence of several sensors allows you to determine the weather conditions in different areas: these can be different rooms of the same building or different parts of the world. The location of the sensors relative to the structure can significantly change the accounts, therefore, to achieve more reliable results, 2 or more remote sensors are usually provided.

The maximum distance to the main unit of the weather station where an external sensor can be placed. For wired versions (see "Type of external sensor") this indicator corresponds to the length of the standard cable; for wireless, a guaranteed radio communication range is usually indicated within the visibility limit, provided there is no interference or foreign objects in the signal path. Anyway, it should be taken into account that the maximum installation range is usually less than the claimed range in fact. This is due to the fact that the wire can rarely be laid in a straight line, and the radio signal, in turn, is affected by obstacles and electromagnetic interference. Therefore, it is worth choosing a weather station for this parameter with a certain margin.

The temperature range at which the weather station's internal temperature sensor (see "Measurements") can operate normally. Of course, for normal use, it is need to the temperatures in the room do not go beyond the specified range — otherwise the device will give a warning about the impossibility of measurements in the best case, and at worst it will fail altogether. However, it should be noted here that temperature fluctuations inside residential and office buildings are relatively small, and even in the most inexpensive weather stations, the operating range of the corresponding sensors covers these fluctuations with an impressive margin. Therefore, it makes sense to pay close attention to the measurement temperature in the room only when the device is purchased for non-standard applications — for example, for installation in a greenhouse or in a warehouse with low temperatures.

The temperature range for which the external temperature sensor of the weather station is designed (see "Measurements"). This parameter must correspond to the temperature differences that this sensor may be exposed to during operation — otherwise, malfunctions and even hardware failures are possible. Of course, it is worth choosing a model according to external temperature, taking into account the climate in which it is planned to be used; at the same time, it is worth taking a certain margin both in the lower and in the upper side. The last is connected not only with the possibility of climatic fluctuations, but also with the fact that outdoor equipment can be heated from direct or reflected sunlight; this, of course, must be avoided in every possible way, but it is not always possible to find an perfect fitting location for the sensor.

External representation of the weather station allows you to better fit the model into the interior of the room according to your preferences and taste. Among the models are square and horizontal of two types — horizontal and vertical.

The weather station's design includes specified placement options for the main unit. While this parameter can be somewhat flexible — such as wall-mounted devices used on tables or creative methods for hanging tourist models on walls — only standard options explicitly stated by the manufacturer are considered in this context. Some models may offer multiple claimed placement options.

— Desktop. Placing the weather station on a table or a similar surface, like a shelf or window sill, is a straightforward and effortless installation method. It provides convenience, allowing for easy relocation when needed. However, the limitation lies in the availability of free surfaces, and there's a risk of inconvenience, such as accidentally knocking the device to the floor.

— Wall. Mounting the weather station on the wall using a hook, nail, or similar device is a space-efficient option, offering flexibility in choosing installation height. This method minimizes occupied space, yet the installation process is more complex, often requiring wall drilling.

– Portable (tourist). Portable weather stations, intended for on-the-go use, are not meant for permanent installation, although that option is also feasible. Designed for hikers and travelers, these compact devices are pocket-sized, easily fitting into bags or backpacks. Their design may include features for easy attachment to equipment, su...ch as handles or carabiners, but they typically lack options for table installation or wall hanging. Portable weather stations usually do not use external sensors, and their cases are reinforced for increased protection against dust and moisture.

This concerns how the transmitter in the external sensor of a weather station is powered, specifically for wireless sensor models. Wired sensors, as mentioned earlier, don't have transmitters; they derive the required energy for operation through a wired connection.

The majority of models use sensors powered by standard-sized, replaceable batteries — either disposable or rechargeable cells. This choice is driven by considerations of battery life and the convenience of swiftly swapping out depleted batteries without removing the entire sensor. While this method incurs additional costs for separate battery purchases — either ongoing expenses for disposables or a relatively higher upfront cost for rechargeables—these drawbacks are generally deemed non-critical. Overall, the advantages of this approach outweigh these concerns for several reasons.

Dimensions of the main unit of the weather station. This option allows you to estimate the space required to install the device. However, most modern models are very compact, it makes sense to pay close attention to the dimensions only when you have to install the device in a very cramped place.

Dimensions of the wireless unit (see "Type of external sensor") that the weather station is equipped with. Such units are usually small, and finding space for their installation is not a problem; however, in some situations (for example, when placed in a miniature wall niche), accurate dimensions may not be superfluous.