Funayama TDS Meter, Upgraded Water Quality r, 0-9990 ppm Meter and Temperature Meter, Water r for Drinking Water, Aquariums, etc.

Very fast readout.

I was highly skeptical of the readings at first. Tap water measured at ~200, filtered fridge water tested at ~150, filtered bottled water tested at ~190. Room temperature filtered water tested at ~180... didn't seem to make sense.I only gained confidence in the results when I tested it against distilled water, measured a perfect zero. Added bottled water and the numbers slowly went up. Cool.Also temperature effects TDS measurements, look it up: "TDS Conductivity of ions in water depends on the water temperature. Ions move faster when the water is warm." So for apples to apples comparison, make sure the water is the same temperature.Finally, this also made me think that TDS measurements aren't that helpful for testing drinking water. If bottled water can be as high as 190 and taste great, then what's the point of a low TDS number if you're not even sure what is being filtered out? I know spring water has minerals, which makes it taste better. All you're able to figure out is whether the filter you're testing is removing *some* stuff but you won't know if it's the right stuff.Still, the product worked as advertised and at a good price.

A little difficult to interpret the results, wrong tool for what I hoped to accomplish.

This one arrived very fast, excited to test my water quality but this tester doesn't power on, ah!I sent it back and they were very quick to provide me a replacement and this time I was able to power it on!Again excited to test my water quality and bam, it goes off not to turn on ever again. piece of crap, dont buy.

Worked well to begin with. After about 10 uses it completely died. Might just be the batteries but I'll figure that out later. For temperature it takes a while before it gives an accurate reading.