Comparison Anmez GreenTest ECO 6 vs Anmez GreenTest ECO 4

General purpose of the device. Note that there are many models that combine several purposes at once: for example, a nitrate tester is often combined with a dosimeter or aquatester.

— Nitrate tester. Nitrate testers in the original sense of the word are devices designed to measure the level of nitrates (nitric acid salts) in various products. Initially, nitrates are an important component of mineral fertilizers, they serve as a building material for plants and are found in almost all living things. However, an excess of nitrates in food is harmful to the human body. Therefore, the ability to measure their concentration in a particular product is important for those who care about a healthy diet.

— Dosimeter. Instruments for measuring background radiation. In this case, the function of the dosimeter is rarely the only one, most often it is provided as an addition to the nitrate tester (see above). Nevertheless, such devices are quite capable of both determining the general radiation situation indoors or outdoors, and registering radiation from products and objects, detecting objects contaminated with radiation. You need to follow certain measurement rules for this; they are most often indicated in the instructions, in extreme cases, you can turn to special sources.

— Aquatester. Instruments for determining the overall quality of water. Th...e main criterion for such an assessment is the level of mineralization — the amount of impurities dissolved in water. At the same time, more or less advanced aquatester checks not just the total amount of impurities, but the content of specific substances — hardness salts, organic compounds and heavy metal ions, and based on these three data, they derive a complex result. Of course, no device is perfectly accurate, but with the help of an aquatester, you can quite reliably separate potable water from unsuitable. In addition, such devices are indispensable for assessing the performance of filters — it is enough to measure the water indicators before and after filtration.

— Indicator of electromagnetic fields. Devices designed to detect electromagnetic fields and measure their intensity. Strong electromagnetic radiation adversely affects both various electronic devices and the human body. The sources of such fields can be not only external emitters (power lines, powerful radars), but also home devices — for example, a microwave with a shielding defect. EMF indicators allow you to identify adverse levels of electromagnetic pollution and take timely action.

— Salt concentration tester. Instruments for measuring the amount of table salt in various foods, mostly liquid. Salt is vital for the body, but its excessive amount leads to discomfort and even health problems; and for some diseases, low-salt diets are indicated. At the same time, it is not always possible to determine the salinity by taste: salt can be “disguised” by other ingredients, a raw product cannot always be tasted, etc. Thus, special devices are being produced that allow you to objectively measure the concentration of salt and control its intake.

— CO2 level meter. Devices designed to measure the concentration of carbon dioxide in the air. The most well-known sign of increased CO2 concentration is that the room becomes stuffy. However, according to sensations, it is not always possible to objectively assess this moment — for example, even a freshly ventilated room with a minimum level of carbon dioxide may seem stuffy in the heat, and in the cold, on the contrary, the feeling of stuffiness is dulled. At the same time, an increased content of CO2 leads to various troubles — from headaches and deterioration in concentration to health problems. Therefore, to maintain an optimal microclimate, it is desirable to control the amount of carbon dioxide, for which special devices are produced.

The range of mineralization measurements provided by the device with the function of an aquatester (see "Purpose"); in other words, the range from the lowest to the highest concentration of impurities in water that the device can detect.

To estimate the range in a particular device, the following data will be useful. Mineralization up to 5 mg/L corresponds to distilled water, an indicator up to 50 mg/L is considered optimal for drinking water. A level of up to 150 mg/L is drinking water of average quality (from mountain springs and artesian wells, as well as passed through carbon filters). An indicator of 150 – 300 mg/L is considered the maximum allowable for drinking water, mineralization of more than 300 mg/L makes the water unsuitable for human consumption, and at a level of more than 500 mg/L water can be dangerous to health. However, most modern water testers cover these ranges with a margin: devices with a range from 0 to 999 mg/L, and sometimes up to several thousand mg/L, are not uncommon.

The maximum error that can occur in the operation of the device. Specified as the largest deviation as a percentage of the result. For example, if a nitrate tester showed a result of 150 mg/kg with an error of 10%, the actual nitrate content can be from 135 to 165 mg/kg.

In general, the lower this indicator, the better: low error ( less than 10%) that means high accuracy. However, even in the most inaccurate modern devices, the error does not exceed 15%, which is quite enough for domestic use. So in most cases, you can not pay much attention to this parameter — especially since for measurements that require increased accuracy, there are special rules that allow you to reduce the actual error by collecting statistical data.

Approximate operating time of the device on one set of batteries or battery charge (see "Power"). If we are talking about replaceable batteries, then note that their quality and capacity can be different, but the characteristics usually indicate the maximum battery life when using advanced batteries. In fact, this means that the actual operating time in such a device may be less than the claimed one, depending on the quality of the installed elements.

The range of surrounding air temperatures at which the device remains operational (and at which the error does not exceed the values specified in the characteristics). You can ignore this parameter if the device is planned to be used in rooms with a temperature more or less close to room temperature — such conditions normally tolerate all models. But not every device is capable of working in frost, this possibility should be clarified separately. Also note that although the upper temperature limit can be quite high — +60 °C — devices should still be protected from direct sunlight.