Tensitron's transducers convert a material's tension into a reliable signal that can be used for remote indication, high speed recording, computer hook-ups,
or as input for automatic tension control systems. Customizing strain gaged transducers for specific applications is Tensitron's specialty. Just provide us with the type of tape, band, or web you're working with, its width and thickness, and we'll be glad to make a recommendation.
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Small Space Transducer with 1" Cyindrical Rollers for use on tapes.
P/N: E-415-003    
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Low Force Load Cell with 2" Cyindrical Rollers for use on tapes.
P/N: E-091-02    
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S Column with two Load Cells.
P/N: E-210-00    
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Cantilever Tension Transducer for narrow webs.
P/N: E-200-00    
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Single Roller Web Transducer.
P/N: 4260    
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Pillow Block Load Cell Transducer.
P/N: E-202-00    
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Notched Beam Transducer with 4-1/4" x 2" diameter roller.
For web applications up to 250 lbs.
P/N:
E-095-04-SC    
You need a Signal Conditioner to provide the necessary excitation, amplification, signal conditioning, calibration functions, display/readout and other options necessary to operate strain gaged transducers. 
Calculation of wrap angle forces against sensor.