From: Thermometers and Thermostats : Thermometers & Weatherstations
A wall thermometer is a vital piece of equipment if you are using a greenhouse. It lets you accurately monitor the temperature and temperature is an important factor for healthy plant growth. The most common thermometers consist of a long, clear tube with a coloured liquid inside. The liquid inside the tube expands when it's hot - so the liquid climbs up the tube - and gets smaller when it's cool - so the liquid drops down in the tube. A scale on the wall thermometer lets you read the temperature the liquid has detected.
- Displays current temperature in both degrees Centigrade and Fahrenheit.
- Built in hanging slot for wall mounting.
- Dimensions: 8" (20cm) long x 1¾" (4.5cm) wide.