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These easy-to-use pH pens are waterproof and will float. They feature automatic shut-off, temperature compensation, replaceable electrodes, hold function, stability indicator and temperature readings in either ºC or ºF. Choose pen with sensitivity in tenths (98127) or hundredths (98128).
Pens weigh only 3 oz, measure 7" L x 2" W. Use four 1.5V button cell batteries (included). One-year warranty on pens, six-month on electrodes. Calibration solutions sold separately.