| 摘要 |
A dispenser 1 as shown in figure 1 incorporates, or can receive, a canister 2 holding a quantity of dispensable material (eg a pesticide), the dispenser having indicator means, and sensing means 7 which can sense a level of light in an environment immediately surrounding the dispenser 1, the dispenser bei ng formed such that when it is in use it can be set to dispense the dispensable material in response to the sensing means sensing a predetermined level of light. The dispenser 1 is formed such that once it is activated to dispense the dispensable material it cannot be deactivated until the dispensable material has been dispensed in accordance with settings of the dispenser, an d wherein when the dispensable material has been dispensed in accordance with the settings the indicator means indicates that this has occurred. The invention includes a method of treating a freight container using a dispense r within the container, and which only dispenses a dispensable material (eg a pesticide) in dark conditions.
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