Extech DO700 9-in-1 Water Quality Meter: Dissolved Oxygen, pH, Conductivity, TDS, Salinity, Resistivity, Temperature

Water quality testing often requires juggling multiple instruments, but the Extech DO700 consolidates nine critical measurements into one portable device. It measures dissolved oxygen, pH, conductivity, TDS, salinity, resistivity, and temperature, making it ideal for environmental monitoring, aquaculture, and laboratory use.

Who is it for

Environmental consultants, water treatment technicians, and researchers who need a reliable, all-in-one meter for field or lab work. The IP57 waterproof rating and backlit display support use in challenging conditions.

Main features

• Measures dissolved oxygen (0 to 20.00 mg/L, 0 to 200.0% saturation), pH (0.00 to 14.00), conductivity (0 to 200 mS), TDS (0 to 100 g/L), salinity (0 to 70.0 ppt), resistivity (0 to 100 MΩ·cm), and temperature (0 to 60°C).
• Automatic temperature compensation (ATC) for accurate readings across varying temperatures.
• Automatic calibration for pH, DO, and conductivity.
• Large backlit LCD for clear visibility in low light.
• Data logging of up to 400 data sets with date/time stamp.
• USB interface for PC connectivity.
• Powered by 4 AAA batteries or optional AC adapter.
• Waterproof to IP57 standards.

Specifications

• Dissolved Oxygen Range: 0 to 20.00 mg/L (ppm); 0 to 200.0% saturation
• Dissolved Oxygen Accuracy: ±0.4 mg/L (ppm); ±2% FS saturation
• pH Range: 0.00 to 14.00 pH
• pH Accuracy: ±0.02 pH
• Conductivity Range: 0 to 200 mS (0 to 200.0 µS, 0.2 to 2.000 mS, 2 to 20.00 mS, 20 to 200.0 mS)
• Conductivity Accuracy: ±2% FS
• TDS Range: 0 to 100 g/L (0 to 100.0 ppm, 0.1 to 1.000 ppt, 1 to 10.00 ppt, 10 to 100.0 ppt)
• Salinity Range: 0 to 70.0 ppt
• Resistivity Range: 0 to 100 MΩ·cm
• Temperature Range: 0 to 60°C (32 to 140°F)
• Temperature Accuracy: ±0.5°C (±0.9°F)
• Display: Large backlit LCD
• Data Logging: 400 data sets with date/time stamp
• PC Connectivity: USB interface
• Power Source: 4 x AAA batteries or optional AC adapter
• Waterproof Rating: IP57
• Automatic Temperature Compensation (ATC): Yes
• Calibration: Automatic pH, DO, Conductivity calibration

Tips

For best accuracy, calibrate the meter regularly using standard solutions. Rinse the probes with distilled water between measurements to prevent cross-contamination. Store the meter in a dry place when not in use.