The Smart Sensor 5 Pack with Total Reader includes 5 Rapid RH® L6 Smart Sensors and 1 Total Reader, plus Smart Sensor accessories. The Rapid RH L6 Smart Sensors are factory calibrated using CMOSens® technology to ensure accurate readings. Each Smart Sensor pack comes with a NIST-traceable calibration certificate and comes in tamper-resistant packaging to ensure perfectly calibrated, genuine Wagner Smart Sensors. The new Rapid RH Total Reader combines the Easy Reader and the Smart Reader into one convenient device. The Total Reader works with the Rapid RH L6 Smart Sensors to read RH and temperature from the concrete, while its built-in sensor reads ambient conditions at the same time. Concrete and ambient readings are automatically sent via Bluetooth to the free DataMaster L6. Rapid RH L6 sensors feature a customized version of the SHT35 humidity sensor from Sensirion that has a +/-2% accuracy tolerance at 50% and 90% relative humidity (RH). This important aspect of the L6 concrete RH testing system puts it in direct compliance with ASTM F2170. Standard SHT35 humidity sensors, found in other concrete RH test systems, start to deviate from the +/-2% tolerance at RH levels as low as 50%.