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The 18531 is offered for customers who want a paper CR3000 Operators Manual. This manual comes in a 3-ring binder. The price listed under Ordering Info is for paper manuals ordered without the datalogger. Paper manuals ordered on the same purchase order as the datalogger are available at no extra charge. However, the customer must indicate that they want a paper manual. Otherwise, they will receive a ResourceDVD containing a PDF version of the manual.