TOOL11 is a supremely simple device to use, essentially an oversized vernier calliper.

Although a billiard table like surface is not needed, it is sensible to have the car on something like level ground without any of the wheels in dips or on lumps. Set the steering straight ahead and roll the vehicle back and forth a couple of times to settle the suspension. Resting the gauge on the ground in front of the vehicle with the arms at each end elevated, set the gauge to suit vehicle track width by releasing the two clamp bolts and sliding the two halves apart/together until the desired position is achieved, positioning the measuring tips at half overall wheel/tyre height (i.e. a line drawn horizontally through the hub centre to intersect the wheel/tyre outer edges) on either the wheel rim or tyre wall then pinch up clamp bolts. Have an assistant hold the static measuring tip against the chosen spot, then adjust the other tip until it is just touching the same spot of the other wheel, secure with the lock nut. Finger tight is sufficient.

You now have the track width of the leading edge of that pair of wheels/tyres. Now carefully slide the gauge away from the wheels/tyres, lay it flat and slide it under the car. Reposition the measuring tips on the trailing edge of the wheels/tyres in the corresponding spots. If there’s a gap the vehicle has toe out on that pair of wheels. No gap means toe in. By turning the adjustable tip you can assess how much toe in/out there is. One full turn of the adjuster equates to 0/060”/1.5mm, or as near as damn it 1/16”, so a quarter turn gives measurements down to 0.015”/0.375mm or a tad over 1/64”!! Make any adjustments to the tracking and repeat process from the top to re-check, then repeat for the rear/other wheel pairs.

Importation rules regarding vehicles are very specific: Only those over 25 years in age may be brought in to the USA without compilance to Federal Motor Vehicle Safety Standards (FMVSS).