It is made of high - quality sand - blasted aluminum alloy, which is sturdy and lightweight. It uses infrared speed measurement. The sensor is built - in, immune to external interference. A 10ppm high - precision crystal oscillator is used to make the speed measurement more accurate. It weighs about 0.1 kg, with a length of 100 mm and a diameter of 32 mm. It is smaller than a palm, and the diameter of the speed - measuring pipeline is 12 mm. Measurement range: 3 - 1200 m/s 10 - 3900 ft/s. It is compact and lightweight, and the specially - provided collection pouch makes it extremely convenient to carry when going out. The digital display can present data more intuitively. It has a 1/2 - 20UNF internal thread design, making installation simpler and more convenient. The speed unit can be set to meters per second M or feet per second F at your own discretion.