Extech EC400
ExStik® Conductivity/TDS/Salinity Meter

Waterproof meter with one high accuracy multi-range
sensor that measures four parameters

  • Autoranging meter offers 3 ranges of measurements from tap water to wastewater and any aqueous solution requiring a conductivity measurement, plus salinity using the same conductivity cell
  • 6 selectable units of measure: µS, mS, ppm, ppt, mg/L, and g/L
  • High accuracy multi-range conductivity cell measures Conductivity, TDS, Salinity, and Temperature
  • Adjustable Conductivity to TDS ratio factor from 0.4 to 1.0 - conveniently calculates the TDS and Salinity values when ratio factor is selected
  • Large 3-1/2 digit (2000 count) Digital display with analog bargraph to indicate sample trends
  • Data Hold, Auto Power off and low battery indication
  • Automatic Temperature Compensation of 2% per degree
  • Simultaneous display of Conductivity or TDS plus Temperature
  • Internal memory stores up to 15 labeled readings for easy
  • Self calibration of electronics on power up
  • Easy to replace Conductivity cell module
  • Waterproof design to withstand wet environment
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 Extech EC400 Shown

Product Information


271 KB
Manual 243 KB
PDF Help


EC410 kit includes:
  • EC400 ExStik® Conductivity/TDS/Salinity Temperature Meter, with sensor
  • Protective cap
  • 84µS, 1413µS and 12880µS calibration standards (30mL bottle each), weighted base
  • 3 sample plastic cups with caps
  • Four 1.5V SR44W button batteries
  • 48" (1.2m)neckstrap
  • Carrying Case
Ordering Information
Model Description Buy Online Price
EC400Extech EC400 EXSTIK Conductivity Meter Buy NowSale $85.04
(Reg. $104.99)
EC410 Extech EC410 ExStik II Conductivity Kit Buy Now Sale $113.39
(Reg. $139.99)
Included Accessories
  • (1) Conductivity cell
  • (1) Protective sensor cap
  • (1) Sample cup with cap
  • (4) SR44 button batteries
  • (1) 48"(1.2m) neck strap
Optional Accessories
EC405Extech EC405 ExStik Replacement Conductivity Cell Module For Extech Model EC400 Buy NowSale $30.65
(Reg. $41.99)
EX006Extech EX006 Weighted Base and Solution Cups Kit For Extech Water Quality Meters Buy NowSale $10.87
(Reg. $15.99)
EX007Extech EX007 Spare Sample Solution Cups (24pk) Buy NowSale $10.94
(Reg. $14.99)
EX010Extech EX010 ExStik 3-Feet Extension Cable with Probe Guard/Weight For Extech DO600 Meter Buy NowSale $45.25
(Reg. $61.99)
EX050Extech EX050 ExStik 16-Feet Extension Cable with Probe Guard/Weight For Extech DO600 Meter Buy NowSale $64.79
(Reg. $89.99)
CA895Extech CA895 Small Vinyl Pouch Carrying Case for 45118, and 4515 Buy Now$10.99

*NOTE: Items ordered with optional NIST calibration will require
approximately 10 days to complete the certification.