The pHep* 4 and pHep 5 include features such as a dual-level LCD, battery level indicator, replaceable pH electrode cartridge, stability indicator, automatic shut-off, automatic calibration, waterproof casing plus 100% buoyancy. Both meters have automatic temperature compensation.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.