DIAMETER

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The diameters have been measured by taking single samples on the middle of each tube cane using a digital vernie calliper,rotating it 360 degrees while measuring and writing down an estimate of the highest values.  The larger the diameter of the tubes, the greater the variations between the highest and lowest values, due to the fact that tubes never are completely circular. (For example, ordering tube cane with a diameter between 25,5-26,0 mm means that you would most likely recieve tube cane with a diameter between 25,0-26,0, or sometimes even 24,5-26,0 mm).

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LENGTH AND CURVEDNESS

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The tubes have not been cut to the same length. Some of  the  longer tubes can thus be split in the middle producing two smaller tubes. As for the length of the drones, they all have a minimum dimension that is stated on the product page. Often the length is significantly greater than the minimum value. Even some pf the tube cane has a fixed minimum lenght, see the product page. I have done my best to select the straightest tubes possible, but it’s impossible to avoid a certain curvedness in Arundo donax plants grown in the wilderness.

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DENSITY​​​

 

I have carried out around a hundred density measurements on a wide range of tube diameters in my stock of Arundo donax, consisting of many thousands of tubes, stating an average guideline value of the density on my product page. An electric high precision scale and a measuring glass has been used fot the purpose. However, it should be pointed out that the average values ​​and standard deviation cannot be considered statistically significant, as I have a very large amount of tubes in my stock. 

In other words, the guideline values ​​cannot guarantee a perfect match of the individual tubes ordered, but may in the best of cases give a rough indication of possible density values. 
 

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HARDNESS​​​

 

I have carried out 400 hardness measurements on a wide range of tube diameters of the stock, using a Shore D Durometer (0-100 HD), calculating average values and standard deviations (SD) for the different cane categories. However they shouldn`t be considered being statistically significant, due to the large stock.​

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