1. The solution's freshness. Because the solution is a mixture that includes a type of solvent the life of an open bottle of test solution is very short. As the solvent component evaporates it will change the value of the solution making your tests less accurate.

2. To do a draw down like the ASTM test is not practical most of the time. So many companies have gone to the Dyne Test Pen.

The dyne test pen is subject to contamination on the tip from touching multiple substrates.  It could change from the first test to the second if the first substrate had contamination like silicone or wax on the surface that transferred to the Dyne Pen's tip.

Here is what makes the Doctor Dyne test different:

A. It is packaged in a single use Patented medical grade package with a pre-measured Dyne solution amount.

B. The Dyne solution is sealed in the air tight top section and the medical grade cotton swab is sealed in the bottom section. (Consumer use Q tips have some additives on them and are not "clean" for a true dyne test)

C. The push on top's snap valve allows the Dyne solution to wet the cotton tip.

D. The whole Doctor Dyne package is then sealed 10 each in an triple wall zipper foil pouch to insure freshness and long life.

10 pack foil pouch

Here is how to use the Doctor Dyne.com test system:

1. Put on protective gloves, safety glasses and clothing and remove a test kit from the sealed pouch.

2. Hold the test kit with 2 hands by the top squeeze bubble and the tube protecting the clean cotton swab.

3. Push the top of the squeese bubble to the side until you hear a crack or snapping sound of the internal valve breaking open.

4. Squeeze the dyne solution until it wets the cotton tip.

5. Remove the protective cover from the swab and carefully rub the solution on the substrate you are testing and look for a flat wetting of the solution. If the solution wets out and does not bead up after 2 to 3 seconds the substrate is at the dyne level of the test kit you are using. If it beads up prior to the 3 second time frame the substrate is not at the level of the test you are using. More surface treatment may be needed.