The Pi has lots of capacitors, all of which can potentially hold some charge. As to whether enough to be a problem with your 'explosive gas sterilisation process' I have no idea.
You can find small 0.5" CRT displays which take composite video in older camcorder eyepiece modules. Most are however monochrome rather than colour and, despite having a small screen area, they aren't exactly compact due to the length of the CRT.
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last = None while True: this = read() if last != None: difference = this - last last = this