Purchased for research in graduate school. Now that my research is complete, I'm selling it at a low price. It has been used infrequently and is in good condition. [External Sensor Thermometer] This thermometer has an external sensor that allows you to measure temperatures from a distance. The temperature is measured by the temperature sensor attached to the end of the cord. [For Aquarium Water Temperature Management] The temperature sensor is waterproof. It is ideal for managing the temperature of aquariums for tropical fish, goldfish, medaka, reptiles, etc. The thermometer body is not waterproof. It is not compatible with seawater. [For Refrigerator Temperature Management] The back of the main unit has a magnet. It sticks to the refrigerator, making it ideal for managing the temperature of refrigerators and freezers. [Simple and Easy-to-Read Numbers] Simple design that only displays the temperature. Despite its compact size, the large LCD screen makes the numbers easy to read. [Caution] If used in water containing water purification agents or other chemicals, the metal part of the sensor may corrode rapidly. [Specifications] Body size: 7.8cm x 7.0cm x 2.8cm Sensor cord length: 150cm Weight: 62.5g Measurement temperature: -40℃~70℃ Measurement accuracy: ±1℃ With maximum and minimum value display function [Packing contents] Main unit, AAA batteries, Japanese instruction manual, suction cup