欧美……一区二区三区,欧美日韩亚洲另类视频,亚洲国产欧美日韩中字,日本一区二区三区dvd视频在线

Most natural waters range from pH 4 to pH 9, but commonly are above pH 7 because of carbonates and bicarbonates （alkalinity）. The pH of water used in industry, boiler feed water, and swimming pools usually is kept within a narrow range. Simply add indicator to the sample and compare the color to the spots on the color disc to measure pH.

• A wide range kit applicable to a variety of samples
• A great option for fast, reliable readings

  A wide range kit applicable to a variety of samples

  A great option for fast, reliable readings

  What's in the box

  Includes indicator reagent, color disc, comparator box, two viewing tubes, instructions and carrying case.

  Specifications

  # Tests:300

  Case Style:B

  Method Name:Color disc/
  Wide range indicator

  Model:17N

  Parameter:pH, wide range

  Platform :CD

  Ranges:4 to 10 pH

  Ship Wt. （lbs）:1.0