FAQ
Here you can find the answers to all most frequently asked questions.
What can Greentest do?
Greentest nitrate tester can measure nitrate levels in fruit and vegetables, whether they contain any harmful substances, by determining the relative concentration of nitrate ions. Greentest3 with TDS meter function can measure the concentration of various salts in water. Greentest ECO measures the power of ionizing radiation (gamma-ray and beta-particle flux) to determine background radiation which can be found all around us in a variety of commonly used objects construction materials, household devices, office accessories, etc).
What kind of contaminants are measured by Greentest? Can Greentest detect heavy metals, pesticides and other harmful substances?
Greentest measures the salts concentration in the tested products and water, both salts that are essential and the ones that can cause serious harm to your health. This is especially true for nitrate salts that can accumulate in food products in high concentrations, due to improper cultivation. Greentest is calibrated to show the number of nitrate ions only.

The device is not intended to detect pesticides and heavy metal ions, as they don't influence the electric conductivity. However, he high level of nitrate content found within food products may have a link to higher levels of pesticides, heavy metals, and link to lower levels of antioxidants, microelements and vitamins.
Does Greentest TDS meter measure the pH level of water?
Greentest does not measure the pH level in water, Greentest TDS meter measures the concentration of various salts, solids and acids disolved in water. High molecular organic compounds such as pesticides, herbicides and hydrocarbons cannot be detected by the device. Greentest scale is calibrated in ppm parts per million (ppm) and it determines the amount of foreign ions for 1 000 000 molecules of water. That is why 1 ppm=1 mg/l=0,02 mg-equivalent/liter = 0,01 mM equivalent/liter. (Based on norms provided by the German Institute of Standartization DIN19643).
Can Greentest measure water hardness in flowing water?
No, the measurements can only be conducted in constant and stable water. During measurement, it is important to hold the proble steady and completely submerged in the water.
Can Greentest indicate the freshness of fruit and vegetables?
Greentest can detect the content of nitrates in fruit and vegetables. It is common for some fruits to be stored in the refrigerator for months after harvesting, or with preservatives and chemicals added to make them look fresh. High levels of nitrates may indicate the fruit is not fresh enough, because nitrate ions within the plant cells will gradually be released during storage as the fruits start to decompose. When food is not fresh, nitrate levels tend to rise. Freshness is related to the potential bacteria/fungus level, a matter of hygiene and food safety. Therefore, Greentest does not directly indicate "freshness", but by knowing the nitrate level in fruits and vegetables you may make a more informed conclusion on whether they are fresh enough or not.
What kind of meat does Greentest test?
Greentest nitrate tester can measure the freshness of all types of meat, including fish and poultry.
What kind of background radiation does Greentest detect?
Background radiation is determined by the amount of power ionizing radiation (gamma-ray and beta-particle flux), which are the most harmful to human's health). GreentestEco devices are the only devices available that detect background radiation within the measurements recommended by international standards.
Why is the radiation indicator sound always on?
GreenetstEco starts measuring the background radiation immediately after the device is switched on. It will stop detecting radiation only when the device is switched off. In case of high level of background radiation, the indicator will produce a frequent sound. The result of the ionizing radiation test will be displayed and a recommendation will be issued. Who knows, maybe one day, GreentestEco will save your life.
What is a cumulative dose?
A cumulative dose is the maximum dose accumulated during the whole time needed for the radiation detection process. To start measuring the cumulative dose, press the START-STOP button on the screen. The device continues measuring in the background until the measurement is finished by pressing the STOP button. To clear previous readings, use the Reset button.
What does the Green, Yellow and Red colors results indicate?
The norm (indicated by the green color) for every type of food product has been provided based on European, American and Asian standards and recommendations (references are provided in the user manual – section 1.4). The yellow and red indicators are based on the recommendations of scientists and research from health organizations (this is more of a suggestion than a strict rule to follow).
What to do with a product that has a red color result? Cook, eat, or throw away?
We do not advise you to throw away food products if Greentest shows a red result, we only claim that if you consume all vegetables with a high nitrate concentration for long periods then it will raise the risk of particular diseases, thus consumers are recommended to calculate their daily intake compared to their <insert the full term for ADI> (ADI).

A red color result should help you to determine where to buy your food products and whether it is the right time/season to buy these products.

Mainly fruits do not pose a significant threat due to relatively low nitrate content. As for vegetables there is usually no need to throw away high nitrate concentrated vegetables as some cooking and preparation procedures can lower nitrates by 15‐60%. To reduce the risk of high nitrate concentrated vegetables we recommend that you:



  • Store leafy vegetables in a refrigerator if they are not cooked immediately;
  • Cook vegetables soon after chopping or mashing;
  • Wash and peel vegetables before cooking;
  • Blanch high‐nitrate vegetables in boiling water for one to three minutes and discard the cooking water before consumption.
  • Infant foods such as vegetable puree and vegetable congee should be prepared for immediate use.
  • Store the fresh leafy vegetables in a refrigerator if they are not cooked immediately.
How accurate are Greentest's results?
Greentest is highly accurate with less than 10% margin of error. As proved by proficiency tests held in metrology institution laboratories within China, Hong Kong and Taiwan.
Why does a second measurement of the same product provide different results? Sometimes I have 200mg/kg or more difference.
This variation is explained by the fact that the fruit or vegetable being tested has an irregular distribution of accumulated impurities in different parts of the product. For example, closer to the stems of the content of impurities may be much higher.

In addition, for better accuracy testing should not be conducted twice in the same place, because after the first test, the electric conductivity may change the distribution and composition of nitrates in the location tested. The same happens if you conduct a test of water hardness in the same glass of water twice. In this case, we recommend you use different glasses with the same water.

Please remember, to get more accurate results, you need to carefully follow the guidelines within the user manual and instruction on "How to test".
Does the temperature of food influence the measurements?
The products should be measured when they are at room temperature (at least one hour after storage in a refrigerator), as the temperature of the product will highly influence electric conductivity. The device measures electric conductivity but is calibrated to show the amount of nitrates as there is a direct dependence attached to each type of product. All calibrations are based on products at room temperature only.
Can I use Greentest to detect nitrate content in cooked vegetables?
No. As Greentest was calibrated to detect nitrate ions only in fresh fruit and vegetables
What influences the results of Greentest measurements?
The results of measurements, depends on salt concentration in the intercellular space, conductivity and the condition of the cell membranes of the tested tissue of a product.
Calibrations and updates?
The device is calibrated every time it is switched on. While switching on the device, ensure that the probe is not inserted into the test product. This enhances the measurement precision. Greentest cannot be updated via the internet or any other source. The updated version that will include an expanded list of tested products and other features can be acquired only by purchasing a newer model of the device with an updated version of the software.
Can I change the battery?
The battery cannot be changed, as the device cannot be opened. It can be charged with a micro USB cable. The battery is designed to last 1000 recharges and discharges. One charge will last for 6 hours of continuous use and 3 months for normal household usage. The device has a lifespan of approximately 5 years when used appropriately.
How to clean the device and reduce the risk of bacteria emerging?
Clean the probe with a dry cloth before measuring a product and with a wet cloth after each use (before switching off the device).
Can I add more types of fruits and vegetables?
You cannot do it personally, the device database of fruit and vegetables can only be upgraded by the manufacturer. Greentest cannot be updated via the internet or any other source. The updated version that will include an expanded list of tested products and other features can be acquired only by purchasing a newer model of the device with an updated version of the software. If you have any products you wish to be inserted in the next version of the device, you are free to let us know and we will take it into account.
Why doesn't the device switch off automatically?
The device does not switch off automatically because it may be measuring a cumulative dose. When you press the STOP button on cumulative dose the device will switch off automatically after a couple of minutes. The timing for the auto switch-off feature can be set up in the device settings.
What is the difference between 1 probe and 2 probes devices?
2 probe devices are designed to offer better accuracy for testing water. When testing water, it is very important to ensure that both probes are parallel to each other when immersing them into a body of standing water for the duration of the measuring process.
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