The Leaf Thermometer is a thermometer that represents temperature with color. When it's cold, it turns brown. When it's too hot, it turns yellow. When it's just the right temperature, it changes to a verdant green. With it, you can enjoy watching the changes in temperature in the same way that we enjoy watching the changes in the seasons. On the back is a reusable adhesive seal.



Japan is rich in change of seasons and the regional differences are also very large, from the fresh green of spring and summer, to the red leaves of autumn.

Thermo ink was used to detect the change of temperature. The leaf changes color from green to yellow to brown which mimics transitions of leaves in nature.  

Removable seal is attached to the back of the leaf. Can be attached to a PC or wall.





- Caution -  

Please do not pull it forcibly as it might cause damage.
Please do not put in mouth.
Please do not bring it close to fire or high temperatures. 
Please do not expose to direct sunlight for a long time.
The surface finishing might ware aft due to friction.
Depending on the environment, there is a possibility that color change based on temperature is not as obvious.
The color change is not permanent, it changes depending on the environment of use.
Please do not use it near high temperature and humid places.

leaf phot cl

mds size


mds size


mds size

Leaf L (5 pcs) 
Product size : W65×D167×H0.25mm (each pc)
Package size : W110×D173×H3mm
Product weight : 1g (each pc)
Total weight (including packaging) : 10g

Leaf S (8 pcs)
Product size : W43×D112×H0.25mm (each pc)
Package size : W75×D120×H5mm
Product weight : 1g (each pc)
Total weight (including packaging) : 6g

mds variation

Leaf L, Leaf S

mds mtral


mds spec

Made in Japan

mds price

RM 36.00


mds dpro

leaf phot designer

Hideyuki Kumagai

Designer Profile:

Born in Osaka in 1979. After working at an architectural design firm, he joined T3 Design. He received the Hara Prize at the 7th SHACHIHATA New Product Design Competition, the Good Design Award, and was chosen for the 2011 compilation of “Applied Typography” among other achievements. He works designing almost anything, big or small, and hopes to “create things that help bring about new personal values and new opportunities for communication.”

Designer Comment : 

Our living spaces are often too warm in the winter and too cool in the summer. Maybe we don’t have to use our air conditioners as much as we do. It occurred to me that if instead of using conventional thermometers with numbers, we could be made aware of the temperature in a more intuitive manner, not unlike the way we experience the transition from one season to another.