-2880Hz belt tensimeter 10Hz-500HzIt to measure the frequency of the vibration of the belt when it is struck Features: The instrument can be used to measure the frequency of the vibration of the belt when it is struck (unit: ). scope: 10Hz-500Hz resolution of the: 0.1Hz :1% Battery:4xAAA(Not included batteries) Operating temperature/humidity:0-40, Relative humidity 80%RH Storage temperature/humidity: 0-50, Relative humidity 70%RH Automatic shutdown: It automatically shut down if it is not used for 5 minutes Size: Instrument: 72mmx32mmx140mm Weight: 125g(Do not contain batteries) Color:As Shown Material:plastic Package Contents: 1 * belt tensimeter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.