The easiest method is to do an indirect test and measure the hydogen 
peroxide produced by glucose oxidase.
dilute 10 gm honey with 40gm water at 20degrees Celsius, maintain that 
temperature for one hour.
Using a hydrogen peroxide test strip ( range 0-25mg H2O2 / per litre) 
measure the hydrogen peroxide produced.
Multiply by 5 to get the micrograms of H2O2 produced per 1 gram / per hour.

If micrograms H2O2 / gm /hour is greater than or equal to 10 then HMF is 
lower than 40Mg/ Kg with 95% reliability.

Ruary

> Can anybody tell me how to test for it?

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