Rein tension (IMAGE) University of Helsinki Caption Rein tension can be measured with a sensor attached between the bit and the rein. Credit Nina Mäki-Kihniä Usage Restrictions Credit to: Nina Mäki-Kihniä License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.