Tiles are specific to instruments. Basically the tile serial number and the instrument serial number must match. In the case of the D25LT the way to match tile is to look at the instrument serial number. Using D25LT100144 as an example, the tiles associated with this sensor would be labelled 10144n where n = a number from 0 to 4 where 0 = White tile, 1 = Pale Green, 2= pale Yellow, 3 = Pale Blue, 4 = Grey
If the tile serials do match up to the instrument in use, errors in readings may occur.