What type to specify for a value whose type changes depending on the selected characteristic (uml)?

Question

Database design

I am building a class diagram. What type to specify for a value whose type (the type of the value field changes from boolean to min int max int, etc.) changes depending on the selected characteristic (uml)?
There was an impression that probably it is necessary to deduce types in one class. But I still don’t know how this is implemented.

Product characteristics

• Specifications: Specifications
  
• meaning....
  

Example:
Characteristics: Ambient temperature
value: -14 to 6

Characteristics: Certificate presence
Value: Yes

Characteristics: Room humidity
value: 86%

Characteristics: Pressure
value: 2