Compressed air is delivered through tube 1 into membrane-type pressure stabilizer 2 and further, through restrictor d to measuring chamber 3 and measuring head 4. Depending upon clearance a between the end face of the nozzle and the surface of the work being checked, a definite pressure is established in measuring head 3. This pressure is measured by pressure gauge 5. The pressure-gauge scale can be graduated in units that show the deviation in work size from the basic value.
$4051$EHP,M$