This serves as a cold cathode ionisation gauge consisting of two electrodes anode and cathode. A potential difference of about 2. 2 kv is applied between anode and cathode through current limiting resistors. A magnetic field is introduced at right angles to the plane of the electrodes by a permanent magnet having nearly 800 gauss magnetic field which will increase the ionisation current. The electrons emitted from the cathode gauge head main part of the gauge head are deflected through the use of magnetic field applied at right angles to the plane of the electrodes constructed from to take helical path before reaching the anode loop. Thus following very the chance, Long path of collision with gas molecule is high even at low pressures. The secondary electrons produced by ionisation themselves perform similar oscillations and the pace of ionisation increases the electrons, Rapidly. Eventually are captured by the anode and equilibrium is reached when the level of electrons produced per second by ionisation is the sum of positive ion current to the cathode and the electron current to the anode and is crafted to meet the needs of measure the strain of the gas. This instrument with the sensor having wider range in high, Of applications systems designed for vacuum applications that the final vacuum to be measured in process chamber. These instruments may be utilized vacuum furnaces as well, In high coating units, Sputtering units, Vacuum systems as a variety of others applications where high vacuum to be measured within the spectrum of 10, 2 to 10, 6 m. Bar.