Features: LCD display, simple operation, small and compact size Special water-proof design, submersible Built-in sensor, no sensor wire required Strong suction cup can make it stick to the aquarium inner wall firmly, so that making temperature measurement much more accurate and more convenient. Parameters: Temperature measuring range: -50~70°C Resolution: 0.1°C(>-20°C); 1°C(other range) Accuracy: ±1°C Power: one DC1.5V button battery LR44 Input: 1 built-in NTC sensor Color: refer to the pictures Product size: approx. 47×28×29(mm); Screen size: approx. 27.7×13.4(mm) Ambient requirements: temperature: 0~50°C Net weight: approx. 20 g Package weight: approx. 35 g Package Included: 1 x thermometer 1 x suction cup 1 x button battery LR44