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The 453 and 454 are good reliable scopes and simpler to service than the newer ones. They're among the oldest solid state portables that Tek made and can be had for under $50 for the 453, or $100 for the 454 (those are ebay prices). Personally, I'm using a 465 as my only scope right now. I have a 453 with the TV sync option in storage.
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