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To measure the amount of fluid in a tank, each milk cooling tank is equipped with a measuring stick (also called dip stick). This stainless steel pin is basically a ruler. From the end to the top, little marks which indicate millimeters and centimeters can be read.
When dipped into the fluid, the change from wet to dry indicates the level in the tank.
A socalled "calibration chart" is needed to determine the amount of fluid in the tank. The calibration chart reveals how many liters of fluid correspond with a level reading of for example 46,4 cm.
mm  45 cm  46 cm  47 cm 
0  960  989  1018 
2  966  995  1024 
4  972  1001  1029 
6  977  1006  1035 
8  983  1012  1041 
The excerpt from a chart above, shows that the level reading of 46,4 cm corresponds with an amount of fluid of 1001 liters in the tank.
Because every tank model is different in size and shape, there is a different calibration chart for each model of every make of tanks.
For the benefit of our customers, we have made some of the most often requested calibration charts available through our website. They can be found below.
Model  Chart* 
Mueller O400  
Mueller O500  
Mueller O600  
Mueller O700  
Mueller O800  
Mueller O900  
Mueller O1000  
Mueller O1125  
Mueller O1250  
Mueller O1500  
Mueller O1750 
Model  Chart* 
IK 1700  
IK 2500  
IK 2900  
IK 3300  
IK 3700  
IK 4100  
IK 4600  
IK 5300  
IK 6100  
IK 7600 
Model  Chart* 
DRU 17  
DRU 21  
DRU 26 (short model)  
DRU 32  
DRU 35  
DRU 39  
DRU 42  
DRU 48  
DRU 79 
Model  Chart* 
Packo RM/DX 3800  
Packo RM/DX 4400  
Packo RM/DX 5000  
Packo RM/DX 6000 

The information presented here has been gathered from many different sources. Consequently, there is some possibility of errors or omissions for which we cannot assume responsibility. In addition, this information should not be taken as final in the case of industrial or highly specialized commercial installations. For commercial use, the end user should perform a new calibration once the tank is installed on its final place. The gauger should attach seals to the legs of the tank, to avoid tampering or fraud.