Feltest TensioMaster, Инструкция по эксплуатации

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The magnitude of readings is also independent of speed or
moisture content of the web.
The instrument can be used safely in wet surroundings since
the internal mechanisms are protected by seals and rubber
bellows.
The range of tension measurable with the instrument is 0.5 to
20 N/mm with an accuracy of ± 8.5% of the tension reading.
Operation
1. Set the pointer of the dial indicator to the zero mark by
moving the sliding pointer back.
2. Hold the instrument by the outer housing assembly. Do
not contact the picture frame while taking
measurements.