thermometer-plus-minus, thermometer-chevron-up-down

[Elix-g]

Before submitting a new icon contribution, please confirm the following:

• [X] I have searched all issues to make sure there isn't a request for this icon.
• [X] I have searched the current library to make sure the icon doesn't already exist.
• [X] I understand that brand icons are no longer being added and I can use SimpleIcons for my brand icon needs.
• [X] I have followed the Material guidelines for system icons.

Tell us about your contribution.

e.g. smart home heating thermostats have an option to set a target temperature. Since I don't find an icon which expresses a target temperature modification either up or downwards by a slider, my contribution.

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Upload the icon source.

thermometer-chevron-up-down_plus-minus.zip