Battery Not Included: This PH Electrode Probe does not come with a battery, ensuring you can customize your power source according to your specific needs and preferences for laboratory experiments and educational purposes. Chemical Safety: The probe is free from high-concern chemicals, making it a safer choice for use in schools, laboratories, and educational environments where health and safety are top priorities. Non-Smart Device: Simplify your scientific measurements with this straightforward digital PH probe that does not incorporate complicated smart technology, ensuring ease of use for students and professionals alike. Color: As Shown Material: plastic Package Contents: 1*pH Non-Refillable Electrode Probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.