When HANNA instruments 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 instruments 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 include 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.

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Range	pH	-2.0 to 16.0 pH
Range	Temperature	-5.0 to 60.0°C / 23.0 to 140.0°F
Resolution	pH	0.1 pH
Resolution	Temperature	0.1°C / 0.1°F
Accuracy	pH	±0.1 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.)