The range of Baylis turbidimeter is 

Explanation:

Baylis Turbidimeter:

• It consists of a closed galvanized iron box and two glass tubes.
• One of the glass tubes is filled with water whose turbidity is to be measured and the other glass tube is filled with a standard solution of known turbidity. The bulb is lighted and the color of the blue light in both the tubes is observed from the top.
• If the colors in both the tubes differ, the tube with the standard solution is replaced by another tube with a different standard solution, and the process is repeated till the color of the blue light in both the tubes match. The turbidity of the water sample tested will then be equal to the turbidity of the matching standard solution.
• With the help of the Baylis turbidimeter, it is possible to measure accurately very low turbidities in the range of 0 to 2 ppm.

Additional Information

The commonly used turbidimeters are as indicated below:

1. Nephelometer:

• It is a modern commercial turbidimeter that is commonly used these days particularly for measuring low turbidities as in the case of treated water or drinking water for which turbidities usually fall in the range of 0 to 1 ppm.
• The measurement of turbidity is based on the intensity of light scattered at right angles to the incident light.

2. Jackson Turbidimeter (Jackson Candle Turbidimeter):

• It consists of a graduated glass tube placed in a cylindrical metal container which is supported on a metal stand.  
• For measuring the turbidity of the water, the candle is lighted and some quantity of water to be tested is poured into the glass tube and the image of the candle flame is observed from the top of the glass tube.
• With the help of the Jackson turbidimeter turbidity from 25 JTU to more than 1000 JTU may be measured.​