FAQs Single template

Most of our devices have 1,2,4,8 and 12-hour time-weighted avarages (TWA) this is because a TWA inherently will take into account any (or zero) readings into its average.

Where the device or consideration for a persons’ exposed hasn’t been operating for the 8-hour average, the calculation will include the null period of zero readings. Reducing the on device reading can be misleading if it’s not understood, so shorter time frames are included for local extrapolation depending on requirement.

Note: If you’re looking for indicative readings against an 8-hour sample then the 8-hour average reading should be used, but the device must be running for 8 hours before the reading is
generated.