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. ▲Specifications ▲Measuring range:10-680Hz ▲Belt free strand length:Max 999.9 mm ▲Belt width:Max 999.9 mm/R ▲Belt mass:Max 999.9 g/m ▲Precision:±1HZ 100HZ ▲Digital sampling accuracy:<1% ▲Display accuracy:±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 ▲Package size:248mmx206mmx52mm