EXTECH EC400: ExStik® Conductivity/TDS/Salinity Meter

EXTECH EC400: ExStik® Conductivity/TDS/Salinity Meter

EXTECH EC400: ExStik® Conductivity/TDS/Salinity Meter

The EXTECH EC400 is a compact and versatile 4-in-1 water quality meter designed for measuring Conductivity, TDS, Salinity, and Temperature with precision and convenience. Featuring patented sensor technology and an advanced microprocessor, the EC400 delivers accurate and repeatable results across a wide range of water conditions — from tap water to wastewater.

Its auto-ranging functionality, multiple units of measurement, and adjustable conductivity-to-TDS ratio make it ideal for laboratory, industrial, and field applications. The built-in memory stores up to 15 labeled readings for quick recall, while self-calibration at power-on ensures dependable operation.

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Key Features EXTECH EC400: ExStik® Conductivity/TDS/Salinity Meter

• Measures 4 key parameters: Conductivity, TDS, Salinity, and Temperature.

• Auto-ranging: Supports three measurement ranges to handle a wide variety of water types.

• Multi-unit support: Displays results in µS/cm, mS/cm, ppm, ppt, mg/L, and g/L.

• Adjustable TDS ratio: Customizable conductivity-to-TDS conversion factor (0.4 to 1.0).

• Internal memory: Stores up to 15 labeled readings for easy data review.

• Self-calibration: Calibrates automatically upon startup for accuracy.

• Water-resistant: IP57-rated housing for use in harsh or wet conditions.

• Complete kit: Comes with meter, conductivity cell, protective cap, sample cup, batteries, and neckstrap.

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Specifications

• Conductivity Range:

  • 0 to 199.9 µS/cm

  • 200 to 1999 µS/cm

  • 2.00 to 19.99 mS/cm

• Conductivity Accuracy: ±2% full scale

• Conductivity Resolution: 0.1 µS/cm, 1 µS/cm, 0.01 mS/cm

• TDS Range:

  • 0 to 99.9 ppm (mg/L)

  • 100 to 999 ppm (mg/L)

  • 1.00 to 9.99 ppt (g/L)

• TDS Accuracy: ±2% full scale

• TDS Resolution: 0.1 ppm, 1 ppm, 0.01 ppt

• Salinity Range:

  • 0 to 99.9 ppm (mg/L)

  • 100 to 999 ppm (mg/L)

  • 1.00 to 9.99 ppt (g/L)

• Salinity Accuracy: ±2% full scale

• Salinity Resolution: 0.1 ppm, 1 ppm, 0.01 ppt

• Temperature Range (Contact): 32°F to 149°F (0°C to 65°C)

• Temperature Accuracy: ±1.8°F / ±1°C

• Temperature Resolution: 0.1°F / °C

• Memory Capacity: Stores 15 labeled readings

• IP Rating: IP57 waterproof and dust-resistant

• Power Supply: 4 × CR-2032 (3V) button cell batteries

• Certifications: CE

• Dimensions: 1.4 × 6.8 × 1.6″ (35.6 × 172.7 × 40.6 mm)

• Weight: 3.8 oz (110 g)

• Warranty: 2 years

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Summary

The EXTECH EC400 is a reliable and efficient solution for monitoring water quality in various environments. With its ability to measure multiple parameters using one electrode and its user-friendly features such as memory storage and auto-calibration, it ensures fast, accurate, and repeatable readings — all in a durable, handheld design.