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The PEN-PRO has a measurement range of Brix 0.0 to 85.0% which can be used to measure almost any sample. There are 2 ways to measure with the PEN-PRO. Either dip the tip into the sample and press the START key OR press the START key and touch the tip into the sample. There is also the new feature to perform continuous measurements. The NEW PEN-Harvest Refractometer is designed for measuring Brix/Sucrose. The PEN type refractometer is extremely easy to use. Just dip it in the sample and press the start key or press the start key first and then dip it in the sample. It takes 2 seconds to get the reading and you can rinse it off under the faucet.