[TenTec] Zero beating aids?

[Dale Saukerson]

>I don't know if you're only interested in homebrewing the zero-beat, Dale.
>If you're interested in a kit, Chuck Olson, WB9KZY, has a neat little
>circuit he calls Son of Zerobeat. Stealing his description, "Son of Zerobeat
>has 7 LEDs which graphically indicate the frequency of a received CW audio
>tone. Adjust your transceiver's frequency until the center green LED lights
>and you are within +/- 10 Hz of zero beat with the transmitting station."
>It was a fun kit to build and only cost me 28 bucks! He's got a manual
>available online, too.

Homebrew, kit, complete--all are welcome.
I just prefer not to use a PC and software.
Thanks for the suggestions so far.