Making a home made Oxy Probe

I have been firing in gas for the past year + and have been doing cone 10 reduction which has been working fine. However I think I am wasting gas by over reducing and wanted to purchase a oxygen probe to relaly see how much I am wasting and correct it. However at $800 a oxy probe is out of my reach right now. Then I came across a home made version that I could build for about $50. What do you think should I give it a try?

http://members.optus…ust_sniffer.pdf

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