The XL Variable Incidence Tribometer not only comes with complete accessories, including a fixture to facilitate the metering of stair nosings, but for a limited time I am supplying free of extra cost a copy of my safety engineering textbook Pedestrian Slip resistance: How to measure It and How to Improve It, Second Edition, with every slipmeter order. If you study the book carefully and experiment with the dynamics of the English XL Variable Incidence Tribometer under all conditions described in the book, you can become a competent operator of this leading edge slipmeter. Then obtaining the documents cited in the reference lists in the various chapters of the book and becoming conversant with their contents, as well as completing the certification course, can make you an expert.

I have done all I can by designing and offering for sale the best slipmeter available and writing the most complete engineering textbook on the history and the current state of the tribometry art. The rest is up to you. Most of my customers tell me that the English XL is the easiest-to-use slipmeter they have seen or used, but to get good enough to be able to win in court reliably, you will have to develop your own background in the theory of pedestrian slip resistance measurement and the related scientific literature and be able to identify and confute spurious and specious arguments. There is a comprehensive program to offer specialized training that leads to issuance of a Certificate of Competence for XL users.

Perhaps the best indication of the XL's credibility is the XL Users List. You can see that the number of happy users has grown impressively, and visiting the sites linked from that page may help you decide if a VIT (or Variable Incidence Tribometer, as it is styled in ANSI/ASTM F1679-96, ASTM D5859 and OSHA 1926) is what you need. Then if you have questions, please call me at the World Headquarters of William English, Inc. at 239-728-3254. I would be glad to discuss any aspect of slipmeters and pedestrian slip resistance with you. For application materials see the certification program.

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