Specification Brand : MEELYHOME BulletPoint1 : IP67 is an international waterproof and dustproof certification. for Protection against dust intrusion, short-time BulletPoint2 : Easy to operate,carry. Easy to change electrode. ATC symbol indicates that the instrument is in automatic temperature compensation mode. BulletPoint3 : hydrogen meter with sensitivity probe. with backlight, data hold function. BulletPoint4 : for Ideal for testing water, swimming pools, aquariums, spas, hydroponics, laboratory, and drinking water, BulletPoint5 : Measuring range: 0-4000ppb /0-4.000ppm, resolution 1ppb/0.001ppm. ExternallyAssignedProductIdentifier : 7626930619063 ItemName : Digital Hydrogen Meter Water Quality Tester with ATC Accuracy Pen Type Meter Data Hold Function LCD Displays Meter Hydrogen Tester ItemTypeKeyword : science-lab-ph-meters Manufacturer : hwdjiSW PartNumber : hwdjiSW ProductDescription : Digital Hydrogen Meter Water Quality Tester with ATC Accuracy Pen Type Meter Data Hold Function LCD Displays meter hydrogen tester Features: Measuring range: 0-4000ppb /0-4.000ppm, resolution 1ppb 0.001ppm hydrogen meter with sensitivity probe. with backlight, data hold function. Easy to operate,carry. Easy to change electrode. ATC symbol indicates that the instrument is in automatic temperature compensation mode. IP67 is an international waterproof and dustproof certification. for Protection against dust intrusion, short-time for Ideal for testing water, swimming pools, aquariums, spas, hydroponics, laboratory, and drinking water,