Slight clicking sound as it operates, but works exceptionally well. Great for indicating when my tea is at the right temperature to drink comfortably.
I was a Biomedical engineer before I retired. I like well made devices that display complex idea's in a easily understood working projection. This device surpasses that expectation. Highly recommended.
This is an amazing and fun office curiosity. I have it on my desk and often show it to curious visitors. Of course, that means I've consumed copious amounts of coffee showing it off! I work in an office full of engineers and they all love it - it resonates with their inquisitive nature.
Very well built - works perfectly