Greentest determines the content of nitrates in vegetables and fruits. The operating principle of the nitrate device GREENTEST is based on measuring the electrical conductivity of the fruit or vegetable. Each fruit or vegetable contains ions of salts of potassium, sodium, magnesium and fluoride. Using GREENTEST for measuring conductivity of fruits and vegetables, we can determine the number of ions of salts.
GREENTEST devices are calibrated on the basis of comparative results of the device and laboratory equipment. The analyses conducted in the certified laboratories showed that the component of nitrate ions typically account for over 98% of all conductive salts found in fruits and vegetables. The effect of ions on the final measurements of other salts is less than 2%, which is insignificant for our purposes.
According to the laboratory results, we have inserted in GREENTEST devices a number of dependencies of the measured conductivity on the concentration of nitrate ions, defined for various fruits and vegetables.
GREENTEST shows the result of express-analysis as the concentration of nitrate ions and it’s comparison with the maximum permissible concentration (MPC) for the product which is measured.
The accuracy of GREENTEST measurements on nitrate content is 90%. This accuracy has been certified through a rigorous testing by international laboratories and specialized institutions.
GREENTEST measures:
Nitrates in fresh fruits and vegetables: Namely, the concentration of various salts in the tested product, including salts that contain essential nutrients as well as salts that can cause serious harm to your health. Greentest technology helps to detect the weight concentrations of salt ions such as: (Cl) chloride, (SO4) sulphate, (NO3) nitrate, and (NO2) nitrite-ions and calibrated to show the precise amount of nitrate ions. Nitrate salts accumulated in high concentrations due to improper cultivation of fruit and vegetables present serious risk to human health.
Water Hardness: Greentest is a TDS meter (Total Dissolved Solids) which can detect the concentration of various salts, solids and acids dissolved 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) and it determines the amount of foreign ions for 1 000 000 molecules of water. That is why 1ppm = 1 mg/l = 0,02 mg – equivalent/liter = 0,01 mM equivalent/liter. The norms are provided by the German Institute of Standardization (DIN19643).
Background radiation determined by the amount of power of ionizing radiation (gamma-ray and beta-particle flux). Greentest ECO starts automatically collecting radiation ions right after you switch on the device and will signalize you if the radiation background is above the norm. All the displayed results and norms of Greentest ECO are based on the international safety standards.
Wherever you are and whatever you do, GREENTEST will be analyzing the radiation background and someday it will save someone’s life!
Portable and easy-to-use Greentest is a fast 3-in-1 nitrate, water hardness and background radiation detector. Just by pressing the START button you can determine the amount of nitrates in the food you eat and the total amount of dissolved solids (TDS) in the water you drink for 3 seconds. Within 10 seconds you can determine the levels of radiation of the environment and of specific objects. For better accuracy in conducting a nitrate test, we recommend to consider the following measurement tips:
Testing of tropical and other fruits
Including: Pineapple, Jack Frutt, Citrus fruits, Kiwi, Pitaia, Banana, Starfruit, Longgan, Peach, Mangosteen, Mango, Apple, Pear, Strawberry, Grapes.
All fruits in this category can be tested on each side, inserting the probe completely into the fruit's shell. For very small fruits such as strawberries and grapes, only the first test can give an accurate result. Due to the destruction of cells after the first measurement, subsequent measurements will provide an inaccurate result.
Fruit with large pits or seeds should be tested very carefully so that the probe pin does not touch or be close to the seeds.
Testing of pumpkins, watermelons and melons
Including: Bitter gourd, Bell pepper, Pumpkin, Winter melon, Luffa, Eggplant, Marrow, Cucumber, Tomato, Corn, Melon, Watermelon, Honeydew melon, Cantaloupe
These types of fruits and vegetables are tested well on each side, but only through the bark. Since most are soft inside, the bark will help keep the device steady during measurement, even the slight movement of the device during the test procedure can distort the end result.
For more accurate results, choose a central location on the side of the fruit or vegetables to test as this will give you the average nitrate content of the whole fruit or vegetable.
Remember to remove the lower and upper part of the fruit or vegetable because the concentration of nitrates in these parts is higher.
Testing of root and tuber vegetables
Including: radishes, potatoes, purple potatoes, sweet potatoes, tarot, yam, ginger, carrots.
These types of vegetables can be tested on each side, but we recommend that you place the probe in the core of the stem. Vegetables from the root and the bulb are crisp and brittle if the probe is placed laterally, around the probe pin may occur a crack, creating a space around it. Carefully insert the probe and make sure it is tight.
Testing Leaf Vegetables, Bulbs and Stalks
Including: asparagus, lettuce, lettuce, cabbage, Chinese cabbage, Shanghai Green Vegetable, Choi Sum, Pak Choi, Guy-Lan, cauliflower, broccoli, asparagus, celery, lotus root, garlic, onion.
While testing these types of vegetables, please place the probe on the device in the center of the vegetable head (core), making sure that the probe pin is NOT between the layers or outside the vegetable. Remember that any subsequent insertion of up to two centimeters from the first may show an incorrect result, since after the first insertion the cell membranes can be destroyed, the vegetable juice will leak into the intercellular space, and this will affect the electrical conduction and the end result. There is also a high risk that the probe will re-enter the space of the previous hole.
Due to the structure of these types of vegetables, the core of the stem is the only part that will return the correct result, although they will show the highest level of nitrate in the tested vegetable.
Step by step guide
• remove the green cap
• first clean the probe with a wet, then dry cloth
• turn on the device
• each time the device is switched on a calibration is performed to ensure that the probe is clean and not inserted into the test product
• settings for "weight units" and convenient use
• select the product you will test from the device’s list
• you can now insert the probe into the product, the depth of insertion is 10 mm or more, the tip of the probe pin must be inserted into the flesh, the tip should not come out of the plant or be poured into seeds, pitches or inner cavities
• Click the "Start Test " and hold the device steady during measurement
• wait 3 seconds and see the result
