New BTT-2880S Digital Sonic Belt Tension Tester Range 10-680Hz Portable Belt Gauge Spec：It can be used to measure the vibration frequency (unit: Hertz) of the transmission belt when it is hit or moving fast. Specifications Measuring range 10Hz-680Hz Belt free strand length Max 9999 mm Belt width Max 999.9 mm/R Belt mass Max 999.9 g/m Precision ±1HZ 100HZ Digital sampling accuracy < 1% Display accuracy 土1Hz Overall accuracy < 5% Operating temperature +10° C~ +50° C Transport temperature -5°C~-70° C Display LCD Measurement unit Hz/N Power supply 4×1.5V AAA Housing Plastic(ABS) Dimensions 140mmx7mm2x34mm Standard Accessories Main Unit (one),Operating Instructions (one copy),Portable suitcase(one) Principle The calculation and measurement are based on the principle of "transverse vibration of string".The tester will pick up the vibration of the belt and record it as a frequency.Enter the mass, width, and span in the following formula.frequency The relationship between and tension can be calculated in the following formula： T=4xMxWxS2 xF2 x10-9 Features Adjustable probe.Can store 20 set belt parameters.Maximum frequency: 680 Hz.Automatic shutdown, etc.