As a home brewer you'll know the importance of taking a specific gravity reading at the start of your fermentation and then using that to work out the progress with subsequent readings. Using a reftractometer will not only give you a more acurate reading it will also save you time. It only requires a drop of your precious brew on the glass plate which you simply whipe clean when your done. That's got to be easier than filling a trial jar and using a hydrometer and then cleaning/sterilising it all afterwards.
Whatsmore! We've slashed to the price of the refractometer to just £29.95.