• Measuing Range: (ppm) 0.01 to 3.50ppm
  • Resolution 0.01ppm
  • Accuracy ±0.02ppm @ 1ppm
  • Advanced optical system
  • Independent 2-point calibration for Free and Total Chlorine
  • Requires only a 10mL sample size
  • Battery operated for field and on-site testing
  • Data Hold and Min/Max record/recall
  • Auto power off

What's in the Box

  • CL500 Chlorine Meter
  • 1.0ppm Free Chlorine standard solution
  • 1.0 Total Chlorine standard solution
  • Zero Chlorine standard solution
  • Two test bottles and covers
  • Free Chlorine DPD powder (10pcs)
  • Total Chlorine DPD powder (10pcs)
  • Cleaning cloth
  • Six AAA batteries
  • Hard carrying case


The Extech CL500 Chlorine Meter comes complete with all the accessories to conveniently take measurements of both Free and Total Chlorine up to 3.50ppm with 0.01ppm resolution. The method used is adapted from USEPA Method 330.5 for waste water and Standard Method 4500-Cl-G for drinking water.