Aurical Company

Aurical Company, operating as AURCAL LLC from 392 Sycamore Ave, Hayward, CA 94544, is a specialty manufacturer of NIST-traceable calibration standards for water quality and environmental monitoring instrumentation with over 20 years of industry experience. The company distinguishes itself through a manufacture-on-order model—each product is freshly formulated at the time of order rather than pulled from shelf inventory, maximizing remaining shelf life and providing the longest certified expiry in the industry. AURCAL's portfolio spans seven calibration standard categories: low-level conductivity standards available as low as 0.5 µS/cm (claimed as the lowest commercially available worldwide), traditional conductivity calibrating standards, pH buffer standards sold as three color-coded sets, oxidation-reduction potential (ORP) standards, salinity standards from 10 ppm to 50K ppm NaCl with ±1.0% accuracy at 25°C, turbidity calibrating standards, and Pourite anti-bubble additive for agar and gel media. The proprietary flexible-pouch packaging with spout valve on low-level conductivity standards prevents atmospheric CO₂ contamination, enabling multiple uses from a single 500 mL container—a significant advantage over conventional single-use bottled standards. Custom concentration levels are available across all product lines for tighter two-point calibrations. All standards are manufactured directly traceable to NIST Standard Reference Materials, with individual container testing and labeled actual values and tolerances. AURCAL serves drinking water utilities, wastewater treatment laboratories, pharmaceutical water quality programs, environmental testing services, and biotechnology facilities.