Can I calibrate Fliiiight to match a specific powermeter?

You can. 

Fliiiight has highly accurate power reporting (+/-1%). However, if you prefer, you can calibrate your trainer to match a specific powermeter, for consistency between your indoor and outdoor rides. 

Using "Power Matching" features available on some training apps is not recommended. 

To match Fliiiight to a different powermeter: 

1. Do a short ride, recording the power readings from both devices.
2. Take the average reading of both devices.  
3. Divide the Fliiiight's average power by the powermeter's average power. 

iOS

1. Download the 4iiii app, sign in and connect to the trainer. 
2. Select > for more settings. 
3. Select Force Calibration
4. Multiply the default value in the Force Calibration field by the result of your first calculation.
5. Enter this new number in the Force Calibration field.
6. Select Save Changes.

Android

1. Download the 4iiii app, sign in and connect to the trainer. 
2. Select > for more settings. 
3. Press "Firmware Version" four times.
4. Select "Change Scale Factor". Select "Proceed". 
5. Multiply 2.00 by the result of your first calculation. 
6. Enter this new number, and select "Save." 

In other words: newMilliVoltsPerVolt = (TrainerAverage / PowermeterAverage) * oldMilliVoltsPerVolt

Single-sided vs dual-sided powermeters

The trainer can be calibrated to match the average power of a single-sided powermeter. If your left leg/right leg power balance changes throughout your ride, instantaneous readings from the single-sided powermeter can still read higher or lower than the trainer. 

On a dual sided powermeter, the trainer will match the average of both legs.