A liquid contact indicator (LCI) is a small indicator that turns from white into another color, typically red, after contact with water. These indicators are small adhesives that are placed on several points within electronic devices such as laptops and smartphones. In case of a defective device, service personnel can check whether the device might have suffered from contact with water, to protect from warranty fraud.

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Liquid contact indicators are placed on several places in electronic devices. For example, underneath the keyboard in a notebook and on several places on its mainboard. Sometimes the liquid contact indicators are placed in such a way that they can be inspected from the outside. For instance there is an LCI in the SIM-card slot of Apple iPhones and in the dock connectors and headphone jacks of iPods made since 2006.[1] In a Samsung Galaxy smartphone there is a LCI underneath the battery cover near the battery contacts.

The main purpose of the liquid contact indicator is to have a lead to the cause of a defect in electronic devices. The manufactuer will not conduct a repair under warranty for a device with an activated LCI.[1] Still there can be reasons for doubt.

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Liquid contact indicators are also known by other names such as water damage tape, water damage sticker, water contact indicator tape, liquid submersion indicator.

In the simplest form, liquid contact indicators are good for a first lead to the cause of defects. LCIs can be replaced, they are readily available in online electronic stores. But the other interest, use in warranty claims, make them prone to potential misuse. Therefore, manufacturers introduced LCIs that are harder to reproduce, even with small holographic details.