Model
611-A Aqua Tester with Magnifying Prism

• 15 times more sensitivity than conventional comparator methods.
  
• Guaranteed permanent color standards.
  
• Magnified side-by-side comparisons of color standards and test samples.
  
• "No-Meniscus" Nessler tube system. Polished plungers eliminate
  annoying reflections from meniscus curvature, makes color comparisons easy.
  
• Built-in daylight-corrected lamp assures accurate results.

The most advanced visual instrument for measuring color of water over 5
ranges (APHA Pt-Co Color, ASTM D-1209), fluoride, and low chemical
concentrations of chlorine, ammonia, nitrogen, silica, etc.



The 611-A permits tests of very low ranges not possible with ordinary comparator
methods by using special 200mm (about 8 in.) long Nessler tubes to accentuate
the colors under comparison. Tests 24 different low-ranges and the pH of pure
water.