When attempting to calibrate a Go Direct SpectroVis Plus connected by bluetooth with Spectral Analysis 4.8.3 to a chromebook running Chrome OS 79, calibrate may fail. The failure may be related to the latest chrome OS update.
The work around is to connect the GDX-SVISPL by USB or to not update your chromebook until an update to Spectral Analysis 4 is released.
Bluetooth connection and calibration works fine on computers and phones.