🔬 Elevate Your Calibration Game! Produced in an ISO 9001:2015 facility, guaranteeing the highest standards in calibration solutions. Color-coded bottles for effortless selection, making your lab work smoother and more efficient. Each solution is traceable to NIST SRMs, providing peace of mind for your critical measurements. Experience accuracy of ± 0.01 pH at 25 °C, ensuring reliable results every time. Double-sealed with a 2-year shelf life for unopened bottles, ensuring your investment is protected. ISO 9001:2015 certified ± 0.01 pH accuracy NIST traceable The Apera Instruments AI1113 pH Calibration Buffer Solution Kit includes two 8 oz. bottles (pH 7.00 and 4.00) that deliver precise calibration for your pH meters. With a remarkable accuracy of ± 0.01 pH at 25 °C and traceability to NIST standards, this kit is produced in a certified facility, ensuring top-notch quality and reliability for all your laboratory needs.