Rank: Forum user 
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Hi Guys
I have recently carried out a slip resistance test using the above mentioned device. If you have used this device before you would know what Ra and Rz mean. I used the Ra parameter to carry out the measurement. I have entered all my measurement values in the HSE SAT tool software to give me an average measurement. This average measurement need to be interpreted to determine the level of floor resistance i.e. high, medium or low. On the HSE website you can only find an interpretation table for Rz parameter not Ra parameter. Has anyone got an interpretation table for measuring in Ra?
Hope all of the above makes sense. I must admit I'm not expecting a lot.
Thanks anyway
kofi
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Rank: Super forum user
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Why use the Ra values? The slip tool on the HSE site is designed for the Rz values and the Duo by a few quick presses of buttons will measure it easily for you. Also be careful with the results over the years they have found not always to be as accurate as the HSE labs first believed. If you need a reliable result go for the pendulum test. I have met the team that developed the "slip tool" a few times and they have found a few surfaces that have low Rz (and therefore Ra) that have performed well under pendulum test.
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