Straightpoint's ChainSafe is a handy Bluetooth wireless tension loadcell with an exceptional 4-tonne load monitoring capacity. Specifically designed for use along a length of chain, SP's ChainSafe has an unmatched strength-to-weight ratio, with a completely sealed stainless steel enclosure that offers IP67 and NEMA6 environmental protection - making ChainSafe an industry-leading dynamometer in even the harshest operating environments. Boasting an exceptional battery life that can last up to 5 years (based on 3 hours per day), this convenient and versatile chain load monitoring device has an update rate of 1Hz, with the Bluetooth functionality range as far as 100m / 328ft. In addition, it can be connected to any iOS or Android smart device that has the free SP HHP app installed. The app also allows users to log data versus time or on events such as over-and underload. Capacity: 4 tonnes Bluetooth wireless range: 100m / 328ft No battery change required Designed for use with 10mm chain IP67 & NEMA6 protected Internal antennae Conforms to EN1677:2008 Fatigue tested to 30,000 cycles at 1.5 times WLL