I've never had to do a mastitis test before, but so far as I know, the hardware in the kit is reusable and you get like a pint of the solution.. You can also buy replacement solution, so I'd certainly think it would do multiple tests.
FWIW, the thing that concerns me about that photo is the shape of the teat... It's like a football, and I just can't think of a really good reason for it to be wider toward the center but 'pinched' at the base like that.. Plus, the fullness of the udder doesn't seem to match the fullness of the teat..
That's why I'm saying I'd strip and test **if I were you.**
FWIW, the thing that concerns me about that photo is the shape of the teat... It's like a football, and I just can't think of a really good reason for it to be wider toward the center but 'pinched' at the base like that.. Plus, the fullness of the udder doesn't seem to match the fullness of the teat..
That's why I'm saying I'd strip and test **if I were you.**