This 1PCS Professional Auto Stethoscope Car Engine is the perfect tool for automotive mechanics. It features quality chromed-steel construction with a soft PVC hose and probe. The detectable frequency range is 10HZ-10KHZ and it has an anti-shocked design. The probe length is 22.5cm + 7cm and the probe diameter is 0.3cm. This product is made of rubber, plastic, and stainless steel, making it durable and reliable. It is also lightweight, weighing only 0.5kg. With its 12v voltage, it is perfect for automotive mechanics. This product is unique in its design and features. It is perfect for automotive mechanics and is sure to make their job easier. It is also lightweight and durable, making it a great choice for any mechanic.