Wet or Dry
If you wish to obtain the value of µ in the dry, the test is done in the dry. If you wish to obtain the value of µ in the wet, then simply wet the floor in the area where SlipAlert will run.
You can use water to wet the floor if you want to find out how the floor behaves when water-wet, or any other lubricant you choose in order to find out how the floor behaves under that particular lubricant. A lubricant is not necessarily wet; dust, flour and many contaminants act as a lubricant.
Portability
SlipAlert weighs 5kg, so anyone can carry and use it. If the floor is very slippery, then expect it to travel 1 metre or more across the floor from the bottom of the ramp. With most floors it will only run 0.5 metres or so.
So Simple...
It looks simple and it works simply, but SlipAlert's simple design and operation is based on a complex interaction between weight, velocity, slider properties, size, etc., which is tailored to accurately mimic the effect of a person slipping.
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