Control Co.’s Traceable One-Shot Conductivity single-use standards calibrate all conductivity meters and probes for maximum accuracy. They eliminate concern about external container contamination. Calibration is made in the standard’s vial and the container fits all probes. The extra-large opening (1¾” diameter) and depth allow probe calibration in the standard’s polyethylene container. The standards accommodate all conductivity probes and are suited for the lab or field. The standards, Certified Reference Materials, are 100% compatible with all makes of instruments and probes. Accuracy at 25 C is ±0.25 microsiemens for 1, 5, 10 microsiemen solution or ±0.25% for other solutions. Each container is labeled for calibrating conductivity (microsiemens/micromhos), resistivity (ohms) and dissolved solids. To assure accuracy, an individually serial-numbered Traceable Certificate is supplied to indicate traceability to standards provided by NIST and/or a National Standards Laboratory. Double A2LA accredited certification provides the highest achievable level of quality assurance, documentation and accuracy. Certified Reference Materials are produced in the company’s A2LA accredited ISO 17025 calibration laboratory by an A2LA accredited ISO Guide 34 reference material producer. Additional accreditations include ISO 31 (certificate content) and ISO 35 (statistical analysis), plus ISO 9001 (certified quality manufacturer).