Extech EC500 ExStik Water Quality Meter (pH, Conductivity, TDS, Salinity, Temperature)

The Extech EC500 ExStik combines five measurement functions in one waterproof, handheld meter: pH, conductivity, TDS, salinity, and temperature. Unlike single-parameter testers, this flat-surface electrode design measures pH and conductivity directly from a single drop or immersion, with automatic temperature compensation for consistent readings. The dual LCD with bargraph shows both primary and temperature simultaneously, while the replaceable electrode module (Extech EC505) extends service life.

Highlights

• Measures pH, conductivity, TDS, salinity, and temperature
• Flat surface pH electrode and conductivity cell
• Waterproof rating IP57
• Automatic temperature compensation (ATC)
• Replaceable electrode module (Extech EC505)
• Dual LCD with bargraph
• Multi-point pH and conductivity calibration
• Data hold and auto power off
• Powered by 4 x CR2032 button batteries

In daily use

The EC500 is suited for water quality testing in the field, laboratory, or industrial settings. Its flat electrode allows measurement of small sample volumes or surfaces. The auto-ranging conductivity and TDS scales simplify operation, while the IP57 housing withstands temporary immersion. The meter's compact size and replaceable electrode make it practical for routine monitoring and troubleshooting.

Full specifications

• pH range: 0.00 to 14.00 pH
• pH accuracy: ±0.01 pH
• Conductivity range: 0 to 19.99 mS/cm (auto-ranging)
• Conductivity accuracy: ±2% full scale
• TDS range: 0 to 9.99 ppt (auto-ranging)
• Salinity range: 0 to 9.99 ppt (auto-ranging)
• Temperature range: -5 to 90°C (23 to 194°F)
• Temperature accuracy: ±1°C (±1.8°F)
• Waterproof rating: IP57
• Electrode type: flat surface pH electrode, conductivity cell
• Automatic temperature compensation: yes
• Power source: 4 x CR2032 button batteries
• Display: dual LCD with bargraph
• Replaceable electrode: yes (Extech EC505)
• Calibration: multi-point pH and conductivity
• Data hold: yes
• Auto power off: yes

Final note

The Extech EC500 ExStik delivers multi-parameter water analysis in a durable, portable format, backed by replaceable sensor technology.