The Apera Instruments MP511 Benchtop pH Meter is simply the most cost-effective laboratory benchtop pH meter of the 4th generation, providing Accurate Measurement, Quick Response, and Consistent Result thanks to the advanced digital filtering technology and high quality 3-in-1 combination pH electrode. It has three measuring modes for your specific measuring needs: stable measurement display mode, timing measuring mode, and continuous measuring mode. Intelligent functions: Auto Calibration with auto buffer recognition, Auto Temperature Compensation, Time/Date display, easy parameter setup, self-diagnostic information. GLP standard data management, 500 data sets of storage, manual/auto timing storage, RS232 data output. Reliable Structure Design: Large LCD with blue backlit, all connectors are protected by silicon caps. IP54 waterproof and dustproof. What’s in the box: MP511 benchtop pH Meter, 201T-M 3-in-1 combination pH Electrode, 602 Flexible Electrode, pH calibration solutions, power adaptor, RS232 cable, software disk, manual. The meter is CE certified and comes with a 2-year warranty (6 months for the electrode). The company designs and manufactures scientific analytical instruments like meters and sensors for pH, conductivity, turbidity, and dissolved oxygen for over 25 years, and meets ISO 9001:2008 Standards. Parameter Model MP511 pH Electrode 201T-F 3-in-1 Combination pH Electrode Measuring Range (-2 to 19.99) pH Resolution 0.1/0.01 pH Accuracy ±0.01 pH ±1 digit Input Current ≤1x10-12A Input Impedance ≥1x1012 Ω Stability ±0.01 pH/3h ±1 digit Temp. Compensation Range 0 to 100˚C (auto or manual) mV Measuring Range ±1999 mV Resolution 1 mV Accuracy ±0.1% F.S ±1 digit Temp. Measuring Range -10 to 110˚C Resolution 0.1˚C Accuracy ±0.5˚C ±1 digit Others Data Storage 600 Groups Storage Content Serial number, Date, Time, Measuring value, Temperature value, ATC or MTC state Data Output RS232 Power Supply DC9V/300mA IP Rating IP54 Splash-proof and dust-proof Dimensions and Weight (8*9.5*4) inches / 2.1 pounds; with case: 13*15*3.5 / 4.5 pounds