Possible Clues:

• It measures air pressure
• Pressure gauge
• Atmospheric pressure measurer
• Instrument that measures atmospheric pressure
• Meteorologist's device
• It's fine when it goes up to barter around round me
• It may need a tap to tell you what it's going to be like
• Haggle about East Ender''s accommodation for weather forecaster
• This will give you the measure of pressure needed to bargain about round me
• It checks state of sky, except meteor shower