R-0630, the chromate indicator for the salt test, is a known carcinogenic. Info from the Taylor SDS:I am not buying that. Could you please tell us which reagents have been declared carcinogens and by whom?

I checked through the rest of the test kit chemical SDS, none of the others are listed as having carcinogens. Between that and the warnings to avoid skin contact on the silver natrate it's probably wise to try and minimize contact with that particular test kit regeant or sample.
For the rest of the testing, I personally put two fingers over the vial to keep the magnet in check and dump the test sample out, then partially submerge in the pool/spa twice to fill and dump the vial (outside the pool/spa), which rinses both the vial and my fingers.