Take your fertility program into your own hands with this super easy to use tool. Comes with comprehensive instructions on use and interpretation. Lifetime Warranty! Farming is all about solar capture; increasing the efficiency of plant photosynthesis provides farmers and growers with a wide range of benefits. Refractometers are a simple but indispensable tool to gauge photosynthesis, through brix which measures dissolved solids, sugars, vitamins and minerals. Take your fertility program into your own hands with this super easy to use tool. Comes with comprehensive instructions on use and interpretation. We stand by our refractometers and offer a lifetime warranty. Shipping of your equipment order is from New Zealand and the freight charges are calculated at checkout. If shipping is needed within the United States, please order from these suppliers below using the links: Refractomer Agtec Copper construction provides fast, efficient automatic temperature compensation compared to aluminum and plastic imitationsAdjustable eyepiece allows anyone to clearly view resultsAnalog design is robust, accurate, and requires no batteriesComes in a durable, foam-padded carrying caseMeasuring range: 0-32% BrixAccuracy: +/-0.20% BrixCompensation temperature range: 10°C-30°C (50°F-86°F)lifetime replacement warranty, conditions apply.