Mars takes pride in providing their customers with quality products that are dependable and applicable for all of those who use them. This Accessory is developed to both perform and to last the way it was originally intended to. The Mars 25510 pocket thermometer is made of stainless steel with a flexible plastic case and a clip. It is water-proof. The thermometer can measure from -40 to 160 F degrees. It can be recalibrated for accuracy. This Mars 25510 pocket thermometer has a 5-inch long stem and its dial is 1-inch in size. It is a genuine Mars product.