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Fits test tubes, measures samples as small as 0.2 mL. For use in clinical, pharmaceutical, and food labs, wherever sample size is a constraint. The ROSS series of electrodes provide readings stable to 0.01 pH in less than 30 seconds, even in the extreme case of samples varying from one another by 50 °C or more. Results are three to five times more precise than those obtained with conventional electrodes. And, because drift is less than 0.002 pH per day, restandardization is minimized. Recommended Use: Epoxy body for ruggedness and durability. Fits test tubes, measures samples as small as 0.2 mL. For use in clinical, pharmaceutical, and food labs, wherever sample size is a constraint. Aqueous solutions only. Detachable bulb guard included. Cap diameter is 16 mm.