I read where folks use this to hunt with their Etrac detectors. It is somewhat flawed though and a person could infact be missing some detectable targets.
Two tone ferrous has the tone break assigned to 17 on the ferrous scale.
So anything reading a higher ferrous number than 17 will report low tone, not higher tone.
I have had many instances of digging coins where this ferrous number would never read/report lower than 17 on any sweeps of the coil over coins.
This higher ferrous number based on my experiences was caused by higher levels of minerals in the soil, an overall deeper target, or targets (coins) colocated with iron/nails, or a combination.
I have dug 2 targets with etrac w/ 10x12 sef coil that read 27 on the ferrous line. One a silver ring the other a seated dime. The site where these 2 targets were exhumed was not higher mineral ground, but the site was part of a old town since been moved. (circa1800). A lot of nails and rust noted in the soil when even digging other targets. This possible 27 ferrous reading on a good nonferrous target is talked about in Mr Sabisch's explorer /etrac book.
Granted hunting in areas with lots of nails 2TF may help a person hear some good targets better.
Just be mindful using 2 tone ferrous, you may not hear some of the deeper good targets.
What about 4 tone ferrous???
If a person can learn to decipher the lowest tone from the next higher 4TF has a better chance to provide tone on some of the targets in areas like I described above. It's hard for me to decipher so I don't like 4TF. And with the tone break level set at 30, bigger iron can produce higher tone than the lowest tone.
Remember hunting in areas with lower soil mineralization you may in fact be able to run 2TF and still get the higher tone, even on the deeper targets.
You may even while in 2TF get a high tone on one sweep and a low on another sweep. Users will notice the ferrous # does windshield wipe at times when sweeping targets.
If Minelab would have set the 2TF tone break to around 25/27 would have been nice.
This is where the CTX shines over the Etrac. The tone break on CTX is adjustable for ferrous as well as conductive.
I do favor the conductive tones on the Etrac vs CTX though.
Cheers
Two tone ferrous has the tone break assigned to 17 on the ferrous scale.
So anything reading a higher ferrous number than 17 will report low tone, not higher tone.
I have had many instances of digging coins where this ferrous number would never read/report lower than 17 on any sweeps of the coil over coins.
This higher ferrous number based on my experiences was caused by higher levels of minerals in the soil, an overall deeper target, or targets (coins) colocated with iron/nails, or a combination.
I have dug 2 targets with etrac w/ 10x12 sef coil that read 27 on the ferrous line. One a silver ring the other a seated dime. The site where these 2 targets were exhumed was not higher mineral ground, but the site was part of a old town since been moved. (circa1800). A lot of nails and rust noted in the soil when even digging other targets. This possible 27 ferrous reading on a good nonferrous target is talked about in Mr Sabisch's explorer /etrac book.
Granted hunting in areas with lots of nails 2TF may help a person hear some good targets better.
Just be mindful using 2 tone ferrous, you may not hear some of the deeper good targets.
What about 4 tone ferrous???
If a person can learn to decipher the lowest tone from the next higher 4TF has a better chance to provide tone on some of the targets in areas like I described above. It's hard for me to decipher so I don't like 4TF. And with the tone break level set at 30, bigger iron can produce higher tone than the lowest tone.
Remember hunting in areas with lower soil mineralization you may in fact be able to run 2TF and still get the higher tone, even on the deeper targets.
You may even while in 2TF get a high tone on one sweep and a low on another sweep. Users will notice the ferrous # does windshield wipe at times when sweeping targets.
If Minelab would have set the 2TF tone break to around 25/27 would have been nice.
This is where the CTX shines over the Etrac. The tone break on CTX is adjustable for ferrous as well as conductive.
I do favor the conductive tones on the Etrac vs CTX though.
Cheers
, when is the kayos going to end 
most of us by the way hunt in conductive, Cheers , Ps Choppadude I missed the Racer review, to much gap, post the review I missed it 
