Penn Plax is a family-owned company in operation since 1959. They specialize in creating excellent pet supplies for animals both great and small. Best known for producing pet products at affordable prices, the Penn Plax brand is synonymous with innovation and quality, keeping your pet foremost in mind. Analog dial thermometer. 0 to 110 degrees F and -20 to 45 degrees C temperature range. Features a self-stick backing for attachment to tank wall. Dimensions- 4L x 0.25W x 7H inches. This Reptile Thermometer monitors terrarium temperature levels. This product is made in China.