Ambient temperature: 5-40°C Relative humidity: up to 85% The sensitive bulb is completely filled with liquid. If bubbles are present, gently shake the electrode to remove them, similar to a thermometer, to ensure accurate testing. For calibration and testing: 1. Connect the pH electrode to the pH instrument input and ensure proper connection. 2. Perform calibration according to the instrument’s user manual and verify calibration results. For storage and maintenance of the liquid-filled composite pH electrode: 1. After use, rinse the electrode with distilled water and store it in a protective bottle. Activate by adding solution before the next use. 2. If not in use for an extended period, rinse thoroughly and remove excess distilled water. 3. Avoid contact between the sensitive glass bulb and hard objects. Scratches or damage will impair electrode performance. 4. Prolonged use may reduce electrode slope and response speed due to contamination of the sensitive bulb or clogging of the liquid junction. Clean according to the type of contaminant to restore performance. Specifications: Heating voltage: 50.2V (AC/DC) Working current: 5-10mA Measurable pH range: 0-14 Temperature range: 0-80°C Response time: 5 seconds Stabilization time: 60 seconds Power consumption: 0.5W Operating temperature: -10 to 50°C (rated at 20°C) Humidity: up to 95% relative humidity (nominal at 65% RH) Module dimensions: 42mm x 32mm x 20mm Output: analog voltage signal Includes 4M3 mounting holes