LOVIBOND COMPARATOR ONE OF THE MOST SUFISTICATED INSTRUMENT IN THE MEDICAL LAB

This method and the colorimetric technique is the same, it just that there is a little slice different. 

The sample of the medium together with the indicator in marched against the slide different is that

1.      In the first two of the last tube in the comparator rack, is where 5ml of the media is added to, instead of the three which was explained in a precious techniques.

2.      Standard volume of indicator is added to the second tube

3.      At this point the comparator is close and indicator disc is turn on for pH reading.

4.      Add alkali or acid to the first tube till the colors are marched.

5.       Calculate the amount of acid or base added to the medium in the way the colorimetric method is calculated above all.

Note: if agar is used the tube that is makes up of agar and indicator with the one contains only agar must be left to cool and solidifies before any other things. Reading must not take place until the media cooled. Before tube is used, they must be washed very well with distilled water. And finally never compare their color in a direct sun light, special view can be used for artificial light.