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Honeywell Mini-Peeper C7027A 1023 Temp: 0-215°F 1/2" NPT 8ft Leads New Surplus
A nice touch is the Honeywell indicator light that shows status.
Honeywell C7027A 1023 UV Flame Detector (USED)
What I like about Honeywell is the no-nonsense approach to construction.
Honeywell Mini-Peeper Ultraviolet Flame Detector Sensor - C7027A 1023
What stands out about Honeywell is the precise fit of their replacement parts.