Range: 0 - 9990 ppm (mg/L)
Resolution: 0-999: 1 ppm; 1000-9990: 10 ppm (indicated by a 'x10' icon)
Accuracy: +/- 3%
EC-to-TDS Conversion Factor: NaCl (avg. 0.5)
Power source: 2 x 1.5V button cell batteries (included) (LR44 or equivalent)
Battery life: Approx. 1000 hours of usage
Dimensions: 15.5 x 3.1 x 2.3cm (6.1 x 1.25 x 1 inches)
Meter weight: 56.7g (2 oz)
Weight with package: 76.5g (2.7 oz)
The EZ TDS tester provides a fast and dependable way to measure the Total Dissolved Solids in your water samples. It is ideally suited for the rigorous demands of water quality professionals, who will appreciate the practicality of EZ's easy-to-read LCD when demonstrating the before and after results of conditioning and filtration systems. Temperature is compensated automatically to ensure the readings are consistent to the standard or reference temperature.
Regarding the use of the EZ TDS - PPM Meter:
The best use of the PPM (EZ TDS Meter) is to test the water BEFORE you make the colloidal silver with to validate that the water "conductivity" meets the requirement for the colloidal silver maker process in terms of revealing the level of "measurable" particulates.
In short, this meter works well to make sure no charged particles are present that could interfere with the colloidal silver maker's auto shut-off feature before you start the process.
However; in our opinion these types of simple meters are not capable of determining water 'purity' actually, because they do not "see" anything that is not a charged and measurable particulate/substance. Do an internet search regarding VOCs (volatile organic compounds) for more information and a better understanding of this issue.
Regarding measuring colloidal silver with a handheld meter:
There are ionic and Colloidal particles when the solution and the Colloid Master is designed to shut off when the desired ppm is achieved. Depending on the TDS meter, sometimes called a ppm meter, at the time the batch finishes the ionic ratio is measurable to that type of meter and depending on the meter and other conditions the ppm is consistent with the ppm setting of the Colloid Master WHEN the batch initially finishes! When the batch is finished then it goes through another process called dispersion; this is when the particles that entered into solution form nanoclusters, which are neutrally charged, (therefore not measurable by a hand-held TDS meter).
So, the ppm tester can accurately sense the ionic particle stage (when the batch first finishes), but after the particles form into neutrally charged nanoclusters it appears as if the ppm is going down, (at least as concerns a simple TDS meter). There is no device available except to laboratories that will be able to measure the neutrally-charged colloid particles and ions, unless you send the sample into a laboratory or spent over $100,000 on an instrument such as a Malvern Zeta sizer.
TDS meters are in truth, conductivity meters. They work by applying a voltage between two or more electrodes. Positively charged ions gravitate towards the negatively charged electrode. The negatively charged ions gravitate towards the positively charged electrode. The water, in this case as pertains to colloidal silver, produces streams of moving ions, the streams of ions act as a conduit for electrical current, the more concentrated the ions are, the stronger the current.
The TDS meter then interpolates that conductivity of how much current passes from each electrode and the circuit and algorithm of the device gauges and digitally displays the number, usually in PPM, based on how many ions the device senses are in the solution.
We have made the colloid master auto shut-off feature with the final results of total actual ppm in mind. What you see regarding ppm at the end of a batch is a dynamic of the TDS measuring device, which can only see ionic (charged particles + or - ). We tried several hand-held meters, and we chose one that works well with our equipment (displays a relatively accurate reading when the batch first finishes).
What happens after a batch of colloidal silver sits for a day, or several days (dispersion phase), is that, some of the particles become invisible to the ppm tester. You will notice that the greater the drop in measurable ppm with a hand-held meter the greater the color change (colloidal particles have a yellow to gold color) (ionic silver particles are clear).
So, as long as you store the batch out of direct sunlight after it is made it will be okay, and although the ppm may over time may show a ppm measurement (with a handheld TDS meter), below the ppm that it had measured when the batch shut off, for reasons just described. You do not lose any of the total ppm; you just can't measure it anymore with a cheap hand-held meter.
I bet you did not expect to determine the ppm could be this complicated, and believe me, the answer was kept as simple as I could put it, though actually, this is a much more complex issue.
Image alt text: TDS-EZ Tester Range: 0-9990 ppm. From 0-999 ppm resolution 1ppm increments also temp compensation
Price $19.38 sku: 2220066 weight: 0.15 HS (Harmonized System) code: 903090
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