This traditional cream minimum to maximum thermometer with manual reset function is ideal for the avid gardener\'s greenhouse. The small magnets in the alcohol solution filled bulbs will move according to the current temperature, which will then display the current minimum & maximum for the day until you reset the levels. Mercury free and is suitable for indoor and outdoor use. Approximate dimensions: L 205 x W 55 x D 27mm.As designs change from time to time, occasionally the packaging may vary slightly.