Hygrothermograph | Datalogger | Aspirating Psychrometer | Hygrothermometer
Humidity Indicator Cards | Light Meter | UV Meter | Textile Fading Card
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| TEXTILE FADING CARD | Another way of testing light levels is the use of specially dyed textiles produced for determining the lightfastness of certain items such as book covers. The textiles on these cards are made in such a way that the most sensitive textile will achieve just "appreciable fading" in half the time needed for the next most sensitive textile to do so, and so on. |
