The VAKKA series concrete maturity and relative humidity sensors are among the fastest and most reliable concrete sensors available today. VAKKA is designed and manufactured in the USA by HGCR Technology, (HGCR) LLC. VAKKA boasts the world’s fastest environmental stabilization time by drastically reducing condensation. Within minutes of concrete placement, thanks to our patent-pending protective sensor housing, the project manager will be able to immediately begin to collect temperature and/or RH data at the time of placement. With correct data throughout the monitoring period, the maturity estimates become more accurate. VAKKA conforms to ASTM C1074, ASTM 2170, ACI 318, ACI TC 228, and most DOT specifications.