Hanna Milestones 1991 World’s first replaceable electrode pH pocket tester The Checker® 1 (HI98103) was the first pocket pH meter that had a replaceable electrode. The HI1270 pH electrode has a screw cap threaded end that was simple to replace extending the list of the pH meter. The Checker is by far the most popular and recognizable tester in the market with over 1 million meters used. The Checker is still in production and continues to be one of the most popular meters. 1992 World’s first portable pH meter with plain-paper printer The HI9224 was the first portable pH meter with a built in printer. The addition of the printer to a meter was for the customers that required unalterable documentation. This is a great value for many industries including in the pharmaceutical and food industries. 1995 World’s first pocket thermometer with CAL Check™ The Checktemp® series of pocket thermometers were the first thermometers that incorporated a unique calibration check feature for determining any drift of the internal electronics. A switch is used to place the thermometer in CAL Check mode. If the reading was inside ±0.3°C from 0.0°C reference point that is simulated then the internal electronics are within an acceptable tolerance. 1997 World’s first pH tester with double junction electrode The pHel pH testers were the first pocket size meters with a double junction. Many industries have metals or other compounds that react and form a precipitate with silver ions from the silver chloride found in a single junction reference design. With a double junction electrode the silver chloride is located in an inner compartment while an outer compartment is silver free. This design extended the life of an electrode and was useful for customers that preferred the convenience of a tester with features of a traditional laboratory electrode. 1999 World’s first pH/temperature tester with dual-level LCD The pHep®4 and 5 were the second generation of the original pHep. These meters used a large dual-level LCD that allowed many advance features that would only be found on more expensive portable and benchtop instrumentation. The Dual level LCD was able to display both pH and Temperature simultaneously along with a battery and stability indicators. The meters also feature automatic temperature compensation, automatic calibration, battery percent level at start up, waterproof, and a replaceable electrode. pHep 4 and 5 set the standard for all instrumentation manufacturers that offer handheld testers. www.hannainst.com | Introduction ix about Hanna
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