AI5525 Includes Only:PH8500-HF Portable pH MeterSwiss LabSen 831 pH ElectrodeMP500 Temperature probe designed for measuring strong alkaline solutionsFeatures:Long service life able to measure solution containing HF for about 1000 times.Self-Diagnosis of out-of-range value and electrode invalidation calibration reminders calibration date checking clock display easy parameter settingGLP standard data management 500 data sets of storage manual/auto storage USB data outputRugged Structure Design: IP57 waterproof rating; Large white backlit LCD; Soft silicon case gives you a firm and comfortable gripPowered by AAA batteries; the foldable stand also allows use as a benchtop meterApera Instruments PH8500-HF Portable pH Meter is designed for measuring solutions containing strong acid solutions containing hydrofluoric acid and storage battery solutions. The equipped Swiss LabSen 831 3-in-1 Glass pH/Temperature Electrode adopts a special HF glass membrane which is resistant to HF corrosion and is capable of measuring solution containing HF for about 1000 times. The probe also works well in high-temperature samples (up to 100°C/212°F). The unique LabSen blue hemispheric glass membrane has a faster response rate better repeatability and built tough - highly resistant to general impact.This meter has a ±0.01 pH accuracy in a range of 0-14 pH and Temperature Range: -5 to 100°C(23 to 212°F).. Auto Calibration with auto-recognition of up to 12 kinds of buffer solutions temperature. Compensation and supports stable reading/auto-hold display mode. The meter's digital filter technology improves response time and accuracy. Smart Self Diagnosis reminds of out-of-range measurement incorrect calibration and electrode invalidation. Other functions include calibration reminders calibration date checking easy parameter setting. GLP standard data management 500 data sets of storage manual/auto storage USB data output.Reliable Structure Design: Large white backlit LCD; foldable stand allows use as a benchtop meter; soft silicone case gives you a nice firm grip; connector protection cap IP57 waterproof rating; Powered by 3 AA batteries.