The Main page of the instrument homepage shows the basic information on the measurements, see Main page. The Diagnostics page shows more information, see Diagnostics.
The measurement result is calculated from the refractive index (nD) and process temperature (T) values. Both of these values are available on the Main page.
In addition to these measurements, the refractometer monitors its internal temperature and humidity, which are both available on the Diagnostics page. The internal temperature should be below +55 °C (+131 °F), and the humidity should be below 30 %.