, each has its own conversion factor:
KCl: Potassium Chloride is the international standard to calibrate instruments that measure conductivity. The COM-100 is factory calibrated with a 1413 microsiemens solution is the default mode is EC-KCl.
442TM: Developed by the Myron L Company, 442TM simulates the properties of natural water (rivers, lakes, wells, drinking water, etc.) with a combination of 40% Sodium Bicarbonate, 40% Sodium Sulfate and 20% Chloride.
NaCl: Sodium Chloride is used in water where the predominate ions are NaCl, or whose properties are similar to NaCl, such as seawater and brackish water.
Measurements in EC (µS) do not have a conversion factor, but do require the correct setting for the proper temperature coefficient.
Other TDSMETER.CO.UK products use the NaCl conversion factor.
Is pinpoint accuracy always necessary when testing for TDS or conductivity?
Usually not. TDS is primarily about range. For the majority of industries that require TDS testing, such as drinking water, aquaculture, hydroponics, etc. it is more important for your TDS levels to be within a certain range. There are a few industries that do require a precise ppm level, but that level is almost always zero. With the exception of colloidal silver, there is never a time in which someone needs an absolute precise level of TDS in their water.
Don’t you need the minerals in your drinking water?
It is believed that mineral waters help furnish elements for body metabolism. However, there is scientific proof to suggest that most of these minerals are in an inorganic (dead) form. While they may enter the circulation, they cannot be used in the physiological process of building the human cell.
With this in mind, we can see that mineral water may give "dead" or "inorganic" minerals to the body which cannot be properly assimilated.
These inorganic minerals only interfere with the delicate and complex biology of the body. 4
The body's need for minerals is largely met through foods, NOT DRINKING WATER." -The American Medical Journal
Fact: The organic minerals in tap water represent only 1% of the total mineral content of the water.
One glass of orange juice contains more beneficial minerals than thirty gallons of untreated tap water.
Organic, or Bioavailable Minerals
Only after they have passed through the roots of plants do these inorganic minerals become organic (through photosynthesis) and capable of being assimilated into our tissues as ORGANIC Minerals.
Pure water removes the inorganic mineral deposits in your body. Organic minerals are fully absorbed and remain in your tissues.
According to many nutritionists minerals are much easier to assimilate when they come from foods. Can you imagine going out to your garden for a cup of dirt to eat rather than a nice carrot; or drinking a whole bathtub of water for LESS calcium than that in an 8 ounce glass of milk?