A calibration bath device , comprising: a tank ; a propeller disposed within the tank; a stir motor coupled to the propeller; a processor coupled to the stir motor; and a memory storing instructions that, when executed by the processor, cause the calibration bath device to: obtain a temperature of a fluid disposed within the tank; obtain an expected viscosity value of the fluid in the tank based on the temperature; obtain a power level value based on at least one of the temperature and the expected viscosity value; generate a control signal based on the power level value; provide the control signal to the stir motor, the control signal causing the stir motor to rotate at a speed; characterised in that the memory stores also instructions that, when executed by the processor, cause the calibration bath device to furthermore obtain an actual viscosity value of the fluid in the tank based on the power level value and the speed at which the stir motor is rotating; compare the expected viscosity value and the actual viscosity value; determine that the fluid is deteriorated based on a result of comparing the expected viscosity value and the actual viscosity value; and provide an alert that the fluid is deteriorated in response to determining that the fluid is deteriorated. a tank ; a propeller disposed within the tank; a stir motor coupled to the propeller; a processor coupled to the stir motor; and a memory storing instructions that, when executed by the processor, cause the calibration bath device to: obtain a temperature of a fluid disposed within the tank; obtain an expected viscosity value of the fluid in the tank based on the temperature; obtain a power level value based on at least one of the temperature and the expected viscosity value; generate a control signal based on the power level value; provide the control signal to the stir motor, the control signal causing the stir motor to rotate at a speed; characterised in that the memory stores also instructions that, when executed by the processor, cause the calibration bath device to furthermore obtain an actual viscosity value of the fluid in the tank based on the power level value and the speed at which the stir motor is rotating; compare the expected viscosity value and the actual viscosity value; determine that the fluid is deteriorated based on a result of comparing the expected viscosity value and the actual viscosity value; and provide an alert that the fluid is deteriorated in response to determining that the fluid is deteriorated. obtain a temperature of a fluid disposed within the tank; obtain an expected viscosity value of the fluid in the tank based on the temperature; obtain a power level value based on at least one of the temperature and the expected viscosity value; generate a control signal based on the power level value; provide the control signal to the stir motor, the control signal causing the stir motor to rotate at a speed; characterised in that the memory stores also instructions that, when executed by the processor, cause the calibration bath device to furthermore obtain an actual viscosity value of the fluid in the tank based on the power level value and the speed at which the stir motor is rotating; compare the expected viscosity value and the actual viscosity value; determine that the fluid is deteriorated based on a result of comparing the expected viscosity value and the actual viscosity value; and provide an alert that the fluid is deteriorated in response to determining that the fluid is deteriorated. <EOS>