To assess the potential risk, find the vibration measurement for the tool and convert the value to trigger time. To perform the conversion click here. This conversion will give 2 values. The first, known as the EAV (Exposure Action Value) acts a warning signal for you to take measures that will minimise workers vibration exposure for the rest of the day. The second value, known as the ELV (Exposure Limit Value) sets the maximum time that your workers should use a tool in a single working day. Once this value has been reached the worker should refrain from using vibrating tools for the rest of the day. Note the time is given as "trigger-time" and represents the total use time for the tool not including stoppages. Any stoppages such as lunch breaks or non-tool work and preparation should be added to calculate the maximum job time for using the tool.