General Tools DREF45-121 Digital Wide Range Refractometer
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<b>[Product Information]</b><br>
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<li>The General Tools and Instruments DREF45-121 Digital Wide Range Refractometer is a high accuracy tool for measuring nutrient levels</li>
<li>The industrial tool uses distilled water as calibration reference, giving you a highly accurate reading</li>
<li>Also measures, displays and automatically compensates for temperatures that can cause variants; reports in both Fahrenheit and Celsius</li>
<li>The auto power-off function saves battery life and keeps you testing; also has a low voltage alert</li>
<li>Power source is one 9V battery (included); includes a carrying case, a battery and operating instructions</li>
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