The inspectors, who have an office in the Wholesale Fruit Centre, conducted a random inspection of Mr Down's stall to check whether his produce met strict EC laws.
Regulations state that Class II kiwis must weigh a minimum of 62g - but the two-hour inspection discovered that a
number of the batch weighed 58g.
Selling them - or giving them away - is an offence under section 14 of the Agriculture and Horticulture Act 1964 and
carries a maximum fine of £5,000.
Mr Down, of Clifton Wood, Bristol, said that four grams in weight was equal to about one millimetre in diameter.
He added: 'They were here for about two hours and went through a lot of my stock using their own little scales.
'Then they dropped the bombshell - my kiwis were under weight by four grams, and I would not be allowed to sell them, give them away, or much else.'
Mr Down will now be forced to bin the entire batch - losing £1,000 in sales and paying a £100 disposal fee to to the
Wholesale Centre.