Lub Safe Load Indicator (SLI) system tau tsim los muab cov ntaub ntawv tseem ceeb uas yuav tsum tau ua kom lub tshuab ua haujlwm nyob rau hauv nws cov qauv tsim.Nws Siv rau cov cuab yeej tiv thaiv kev nyab xeeb rau boom hom hoisting machinery.