The sealed glass cylinder contains five floating glass bulbs. Each bulb has a calibrated, weighted metal tag. The temperature is determined by the lowest floating bulb. When there is a bulb in the middle, the temperature should be read as between this degree and the lowest floating bulb.
Temperature range: 16-32⁰C
In case of breakage please refer to the following.
Do not subject to direct sunlight or place near to any heating or cooling vents.