I produced a series of pneumatic detect it with stable performance, reliable, simple structure, high accuracy, easy to operate and can realize the advantages of non-contact measurement, it has been widely used in a lot of the machinery industry. Measuring pneumatic test series products can be used for the following parameters: diameter, diameter, width, pitch, depth, thickness, roundness, taper, concentricity, straightness, flatness, parallelism, squareness, ventilation degree and sealing and so on. According to the customer's measurement needs, providing various types of dedicated pneumatic measuring device. The instrument measuring head with a variety of pneumatic or pneumatic measuring devices supporting the use of comparative measurements with the DUT size or shape and position parameters for precision measurements. According to the needs of the measured parameters, the instrument can piece together the appropriate multi-tube form (up to ten tubes). Dimensions (L × W × H): single tube: 134 × 112 × 524mm multi-tube: an increase in the width of 29mm increase weight: 4.4kg (each additional one, weight gain 2.3kg). Main components: the air filter, the air regulator, the indicating portion, measuring devices. How it works: buoy-type pneumatic measuring instrument is essentially converts dimensional changes were measured for the corresponding change in the air flow of a measuring instrument, when the compressed air through the taper glass tube, makes changes in flow in the inner tube floating buoys location varies accordingly, so the amount of change on the scale from the buoy position can be directly read out by measuring the size of the change. The meter with accessories: pipe number from 1 --- 5 connecting pipe 1.5m / 1 根 plastic tubes per tube 4.5m / 1 根 6 --- 10 connecting pipe 1.5m / 2 根 plastic tubes per tube 4.5m / 1