Colortune test plugs

[Rrbbeerrttoo]

Are there any difference amongst the many Colortune test plug kits being sold....some sell for about $100 some for a lot less on E- bay, with returned warranty. Why the warranty? Is any brand name better than other.
Hate to ask this, but did not find it in the manual. what is the spark plug size in mm.?
Thanks for any comments.

Robert
66' Tr4a irs

 

[Geo Hahn]

I got a Colortune years ago from Moss and another more recently from an ebaY seller (cheap) and there was no difference other than the box & the ebaY seller had to omit the bottle of cleaning fluid to be able to mail it. Not a big deal as I just use carb cleaner on the glass plug.

I'm thinking we have 14mm plugs but douoble check that with someone who's sure.

The item works well and is a bit of fun. The screw connection from the 'plug' to the flexible black lead must be handle with some care (tighten plug directly then thread on the lead & snug it up) but mine has survived many club tech sessions w/o coming to grief.

 

[Got_All_4]

14mm is correct. Color tune should be Color Tune no matter who you buy it from. Never heard of any other brands. I bought mine from e-bay no problems. In fact I love it. Works great on my SUs. Strombergs are a bit more challenging.
My fuel mileage jumped from 23 to 31 mpg in the TR3 and the car never ran better. Even better than when I had it professionally tuned.

 

[Rrbbeerrttoo]

Thanks both of you for the information