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When HANNA® introduced its first version of the pHep ( pH electronic paper) in 1986, it immediately revolutionized the standard in pH measurement. pHep' s ease-of-use in combination with its affordability made it possible for non-technical and technical personnel alike to measure pH on the spot, accurately and inexpensively throughout a variety of industries. Since its introduction, over 1 million pHeps have gone to satisfied customers around the world.

We at HANNA® have always valued the comments and suggestions coming from our customers. For this series, we have included all of the features you have asked for and more! The pHep 4 and pHep 5 includes features such as a dual-level LCD, battery level indicator, replaceable pH electrode cartridge, instability indicator, automatic shut-off and automatic calibration all in a floating, waterproof casing.

Range pH -2.00 to 16.00 pH
Range Temperature -5.0 to 60.0° C / 23.0 to 140.0° F
Resolution pH 0.01 pH
Resolution Temperature 0.1° C / 0.1° F
Accuracy pH ± 0.05 pH
Accuracy Temperature ± 0.5° C / ± 1° F
pH Calibration automatic, at 1 or 2 points with 2 sets of memorized buffers
( pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
Temperature Compensation Automatic
Battery Type / Life 4 x 1.5V with BEPS / approx. 300 hours of continuous use;
auto-off after 8 minutes of non-use
Environment -5 to 50° C ( 23 to 122° F) ; RH max 100%
Dimensions 163 x 40 x 26 mm ( 6.4 x 1.6 x 1.0" )
Weight 100 g ( 3.5 oz.)

Solutions
HI 70004P 4.01 pH Buffer Solution
HI 70006P 6.86 pH Buffer Solution
25 x 20 mL sachets
HI 70007P 7.01 pH Buffer Solution
25 x 20 mL sachets
HI 70009P 9.18 pH Buffer Solution
25 x 20 mL sachets
HI 70010P 10.01 pH Buffer Solution
25 x 20 mL sachets
HI 7061M General Purpose Cleaning Solution
1 x 230 mL bottle
Accessories
HI 73127 Spare electrode for HI 98121, HI 98127, HI 98128, HI 98129 and HI 98130

HI 98128 ( pHep 5) is supplied with protective cap, electrode removal tool, batteries and instructions.
Range pH -2.00 to 16.00 pH
Range Temperature -5.0 to 60.0° C / 23.0 to 140.0° F
Resolution pH 0.01 pH
Resolution Temperature 0.1° C / 0.1° F
Accuracy pH ± 0.05 pH
Accuracy Temperature ± 0.5° C / ± 1° F
pH Calibration automatic, at 1 or 2 points with 2 sets of memorized buffers
( pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
Temperature Compensation Automatic
Battery Type / Life 4 x 1.5V with BEPS / approx. 300 hours of continuous use;
auto-off after 8 minutes of non-use
Environment -5 to 50° C ( 23 to 122° F) ; RH max 100%
Dimensions 163 x 40 x 26 mm ( 6.4 x 1.6 x 1.0" )
Weight 100 g ( 3.5 oz.)

Solutions
HI 70004P 4.01 pH Buffer Solution
HI 70006P 6.86 pH Buffer Solution
25 x 20 mL sachets
HI 70007P 7.01 pH Buffer Solution
25 x 20 mL sachets
HI 70009P 9.18 pH Buffer Solution
25 x 20 mL sachets
HI 70010P 10.01 pH Buffer Solution
25 x 20 mL sachets
HI 7061M General Purpose Cleaning Solution
1 x 230 mL bottle
Accessories
HI 73127 Spare electrode for HI 98121, HI 98127, HI 98128, HI 98129 and HI 98130

HI 98128 ( pHep 5) is supplied with protective cap, electrode removal tool, batteries and instructions.
Manual: ( Download)