The Complete Guide to TDS Meters for Window Cleaning

A TDS meter (Total Dissolved Solids meter) is an essential tool for window cleaning professionals, as it helps to measure the purity of water used in water-fed pole systems. TDS meters work by measuring the electrical conductivity of water, which varies depending on its purity. The meter uses a pair of small metal probes that go into the water to measure this conductivity, providing you with a quick and accurate PPM (parts per million) reading.

How Does a TDS Meter Work?

A TDS meter measures the electrical resistance in water, which changes according to the water's purity and temperature. The meter then calculates the water's purity almost instantly and displays it on the screen.

Water with fewer dissolved solids (like minerals, chemicals, and other impurities) will show a lower PPM reading, while water with more contaminants will have a higher PPM reading. For example, a water reading of 10 PPM means that, out of a million molecules of water, only 10 are dissolved solids.

What Unit Does a TDS Meter Use?

TDS meters measure water purity in PPM (Parts Per Million), which refers to the concentration of non-water elements in the liquid. For instance, if you mix water with a little bit of orange juice, the meter will tell you how many parts per million of the liquid are not water molecules.

If you're using a TDS meter for window cleaning, understanding the PPM readings is crucial for determining if the water meets the purity level required for your waterfed pole system.

Are TDS Meters Accurate?

Yes, TDS meters are highly accurate devices that can measure the purity of water precisely. For the most reliable results, it's recommended to take multiple readings and calculate the average.

Here are a few tips to ensure you're getting the most accurate readings:

• Rinse the meter and cap before every use to avoid cross-contaminating samples.

• Avoid touching the probes to prevent introducing impurities from your fingers.

• Use the most accurate TDS meters: Handheld meters are generally more accurate than inline ones, as inline meters can often measure water that's been stagnant in pipes, leading to inaccurate results.

Do TDS Meters Lose Their Accuracy?

TDS meters can lose their accuracy over time due to various factors, such as:

• Water ingress: If water gets inside the meter, it may never work properly again.

• Low battery: Ensure the battery is fresh to maintain optimal performance.

• Loss of calibration settings: Some meters may need recalibration to restore their accuracy.

How to Calibrate Your TDS Meter

To maintain accuracy, recalibrating your TDS meter is necessary. Use a calibration solution with a known PPM, such as the 342 PPM calibration solution we sell. To calibrate, dip the meter into the solution and adjust it until it reads the correct value.

Calibration procedures vary depending on the model, but most meters allow adjustments through a small screw located on the back of the device.

Can a TDS Meter Be Used for Other Liquids?

TDS meters are designed specifically for water and should not be used for measuring the purity of other liquids. While some specialty meters exist for different liquids, the TDS meters we offer are specifically for testing water purity.

Why Do TDS Meters Matter for Window Cleaning?

TDS meters are crucial in ensuring that your waterfed pole system uses purified water, which is essential for a streak-free finish. For professional window cleaners, using pure water is key to getting the best results without leaving residue on the glass.