 
 <prompt> Hot cathode and cold cathode ion gauges dey di same 'cept for how dem dey do wetin? Given di previous question, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: Ion gauges dey use for ultrahigh vacuum. Dem dey come in two types: hot cathode and cold cathode. For hot cathode version, electrically heated filament dey produce electron beam. The electrons dey travel through the gauge and ionize gas molecules around dem. The ions wey result dey collected for negative electrode. The current dey depend on the number of ions, wey depend on the pressure for the gauge. Hot cathode gauges dey accurate from 10−3 torr to 10−10 torr. The principle behind cold cathode version na the same, except say electrons dey produced for discharge wey high voltage electrical discharge create. Cold cathode gauges dey accurate from 10−2 torr to 10−9 torr. Ionization gauge calibration dey very sensitive to construction geometry, chemical composition of gases wey dem dey measure, corrosion and surface deposits. Their calibration fit spoil if dem activate am for atmospheric pressure or low vacuum. The composition of gases for high vacuums fit dey unpredictable, so mass spectrometer gats dey used together with the ionization gauge for accurate measurement. 