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Specifications: Model: 2019 updated Version Measuring Range: 0-14. 0 pH Resolution: 0. 1 pH Accuracy: 0. 1 pH(20°C ) Use Environment: RH 95%, 0-50℃(32~176℉ ) Battery: 2×1. 5V LR button cell Weight: 1. 76 OZ Features: ✅High Quality and Durable - It's highly accurate for measuring range of 0-14 PH, 0. 1 PH resolution, measure & display pH result simultaneously with LCD display, reliable and quick reading. ✅ Easy to Use - You just remove the protective cap and immerse the PH meter electrode in the solution and turn on the PH by "ON / OFF" switch to be measured. Beats the heck out of trying to see the colors of a litmus strip. ✅Easy to Calibrate - You can simply follow the instruction on the provided packet of solution 4. 01 or 6. 86, immerse the PH tester in the solution until numbers get stable. Package Includes: ► 1 x PH Meter ► 3 x Calibration packets ► 1 x Carrying case ► 1 x User's manual Note: ► Clean the electrode with distilled water every time before and after use. ► Be careful with the glass probe since it may be a little fragile when you use. ► Remember to gently wipe it with a clean, soft cloth when you're done before capping it again. ► Open the battery case or replace battery, then need to re-calibrate the meter