Water Quality Tester, Accurate and Reliable, EC Meter & Temperature Meter 3 in 1, 0-9990 ppm, Funayama tds Meter Digital Water Tester for Drinking Water, Aquariums, etc

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.

Tried it on several different situation and it works great (now just need to figure out the problem it showed I have with my water).

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

I got the meter and thought it might be broken. I’m not sure why they have batteries in the unit after testing from the manufacturer. Purchased new batteries and the unit functions as indicated. Tap water tested to 79 and distilled water tested to 0

Readings were inconsistent and all over the place. Did not self-adjust to compensate for temperature. The same exact water sample had hugely different TDS readings depending on temperature.I would test multiple water samples at one time and then check them again a few hours later and the TDS readings would be completely different. Sometimes just minutes apart, the reading would be significantly different.This TDS meter was pretty much useless.

1. Instructions say insert in water to the Maximum Fill Line (2"). But there is no marking on the device itself. Had to measure 2" and put on a piece of tape.2. No information as to the battery size required. Had to take out the existing batteries to get the number-LR44.3. Instructions had no company information, URL, phone number or even company name. FUNAYAMA is printed on the device. That is the only information available. Maybe there is additional info back on the Amazon product page.4. Device has TEMP button, but no information as to what it does.5. Directions are not clear at all about what to do when making multiple measurements. My experience with it indicates if you used the HOLD button, you need to turn it OFF and then ON again to read another sample.

Very fast readout.

Easy to use. Very good price.