The JUANJUAN PH-686 is a pen-type 4-in-1 water quality tester that measures pH, EC, TDS and temperature. It covers 0-14 pH with 0.01 pH resolution, has automatic temperature compensation and a backlit LCD, and suits drinking water, pools, aquariums and hydroponics.
The PH-686 combines four measurements in one slim, pen-shaped meter: pH, electrical conductivity (EC), total dissolved solids (TDS) and temperature, replacing several single-function testers for routine water analysis. Built-in automatic temperature compensation (ATC) reduces the influence of sample temperature on the readings.
pH is measured over 0-14 pH with 0.01 pH resolution. EC is shown in µS/cm or mS/cm and TDS in ppm or ppt, with the resolution stepping automatically from 1 to 10 units above 1999, and temperature can be displayed in °C or °F. The meter is pre-calibrated at the factory; pH calibration automatically recognises pH 4.00 and pH 6.86 buffers, and EC is adjusted with a small trimmer against a 12880 µS/cm standard at 25 °C.
Typical users are households, aquarists, growers and water treatment workers checking drinking water, aquariums, swimming pools, hydroponic solutions and light laboratory samples.
| Manufacturer | JUANJUAN |
|---|---|
| Model | PH-686 |
| Parameters | pH, EC, TDS, temperature |
| pH range | 0 to 14 pH |
| pH resolution | 0.01 pH |
| EC range | 0 to 19990 µS/cm; 0 to 19.9 mS/cm |
| EC resolution | 1 µS/cm (< 1999 µS/cm); 10 µS/cm (> 1999 µS/cm); 0.1 mS/cm |
| TDS range | 0 to 19990 ppm; 0 to 19.9 ppt |
| TDS resolution | 1 ppm (< 1999 ppm); 10 ppm (> 1999 ppm); 0.1 ppt |
| Temperature range | 0 to 50 °C (32 to 122 °F) |
| Temperature units | °C / °F |
| Temperature compensation | Automatic (ATC), 0 to 50 °C |
| pH calibration | Automatic buffer recognition, pH 4.00 and pH 6.86 |
| EC calibration | Trimmer adjustment with 12880 µS/cm standard (at 25 °C) |
| Display | Backlit LCD |
| Functions | Data hold, one-touch calibration, auto power-off |
| Operating temperature | 0 to 50 °C |
| Housing | Corrosion-resistant ABS |
| Power | Button-cell batteries |
| Dimensions | 183 × 36 mm (length × width) |
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