This digital thermometer is a great little device measuring approx only 2″ long x 1″ wide x 0.5″ deep (50mmx25mmx13mm). As described in the product description it has many uses although my ideal use was a tropical aquarium. It has a good length of probe cable that can sit at any depth in the tank and because of its small size it sits inconspicuously on top of the aquarium lid.
It gives a better accuracy of reading compared to the standard aquarium thermometer as it reads in 1/10th degrees. I liked this so much that I bought a second one at full price for a relative who also has an aquarium and they love it aswell. The photo included shows it sitting on a 4 foot aquarium lid.
DISCLAIMER: I received this item at a discounted price in return for a honest and unbiased review.