Description

A Guide to Stick-On Aquarium Thermometers

A stick-on thermometer, also known as a digital sticker or liquid crystal display (LCD) thermometer, is a simple and effective tool for monitoring the temperature of your aquarium water. These thermometers are designed to be applied to the outside of the glass and work by reacting to the ambient temperature of the glass, which in turn reflects the temperature of the water inside. While not as precise as an in-tank thermometer, they are a great, low-cost option for a quick and clear temperature check.

How They Work

The thermometer’s display contains a special type of liquid crystal that changes colour at specific temperatures. Each numerical marking on the strip corresponds to a different temperature and will light up or change colour to indicate the current temperature. The numbers are typically in degrees Celsius ($°C$), which is the standard measurement in the UK.

How to Use and Apply Your Thermometer

Using a stick-on thermometer correctly ensures you get the most accurate reading possible.

1. Placement: Choose a clean, dry spot on the outside of your aquarium glass. For the most accurate reading, place it near the bottom of the tank, away from any heaters or filters that might create localised temperature variations.
2. Application: Peel the backing off the thermometer and carefully press it firmly onto the glass. Smooth out any air bubbles to ensure full contact.
3. Reading: The thermometer will show a range of numbers. Look for the number that has changed colour most significantly. Often, the current temperature is indicated by a colour like green or blue, while surrounding numbers may be different colours or remain black. Wait for a few minutes for the thermometer to stabilise after initial application or any significant temperature change.