3-in-1 TDS PPM Meter Home Drinking Water Quality Test Pen EC Meter Thermometer

A colorful TDS chart on the back to explains ppm readings. If TDS≤40, the backlit color is green,for Drinking water. TDS: 0 - 9990 ppm (parts per million). If TDS>40, the backlit color is red,for No-drinking water.
A colorful TDS chart on the back to explains ppm readings. If TDS≤40, the backlit color is green,for Drinking water. TDS: 0 - 9990 ppm (parts per million). If TDS>40, the backlit color is red,for No-drinking water.

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