Nothing there consistent in appearance with an infected brew IMO. Package it up and you'll be in good shape. That would be my guess.
I don't favor placing a hydrometer in the FV or leaving it there for a few reasons primarily related to accuracy. These include.
1. Bubbles and yeast/hop debris will often obscure the view of the hydrometer's scale
2: Not possible to optimally view the hydrometer/meniscus interface at eye level
3: The wort temperature is not equal to the hydrometer's calibration temperature
4: The lid must be removed to take a reading increasing the potential for oxygen exposure
5: If leaving the hydrometer in the wort CO2 bubbles will adhere to the glass adding an upward buoyancy force. Also with leaving it in, any settling trub can settle on the shoulder of the instrument creating a downward force.
All small details but added up can lead to significant measurement error. If I am going to record data I want it to be as accurate as possible.
My process:
- Pop off carboy top and airlock
- Collect sample with sanitized SS turkey baster in a test jar
- Replace carboy cap and airlock
- Place hydrometer in sample
- Cool sample and hydrometer to calibration temperature
- Remove and reinsert hydrometer once at the target temperature to remove any bubbles adhering
- Measure gravity and record.
Very repeatable and accurate.
OG and FG (recent example)View attachment 313265
Sample and hydrometer at correct temperatureView attachment 313266
Calibration temperatures vary depending on the hydrometer.View attachment 313267