CMC Linescale 3I LineScale 3i is a high-strength, high-speed load cell designed for the demands of rope rescue, rope access, and technical rigging. Milled from solid aluminum with a 90 kN minimum breaking strength and PPE certification, it excels as a single master point in critical operations such as drop testing or twin tension rope systems (TTRS). The clear digital display and Bluetooth connectivity provide instant feedback in the field, while the rugged build and included components make it easy to deploy, transport, and protect. Engineered for performance and insight, LineScale 3i logs up to 50 hours of high-resolution data and measures up to 1,280 samples per second—capturing every peak load with unmatched precision, even in dynamic events. With storage for over 200 million data points and easy USB downloading, post-operation analysis is quick and intuitive. Through its long battery life, water resistant rating, and free app, LineScale 3i ensures you’re fully equipped for the task, whether you’re monitoring anchor forces or evaluating system performance under real-world loads. Both a next-level teaching tool and a powerful addition to any rigging cache, LineScale 3i enhances testing protocols, improves training outcomes, and supports safer decision-making in live operations. Features Strong: Milled from solid aluminum with a 90 kN MBS and PPE certification – excels as a single master point in rigging scenarios including drop tests and TTRS. Smart: Log up to 50hrs of data and store 230 million data points for easy extraction and analysis. Monitor and record remotely via Bluetooth and the free app. Fast: Speed is critical for measuring dynamic events. LineScale 3i captures precise data at 1,280 samples per second – ensuring you don’t miss the peak load. Fully Equipped: Comes with a full set of accessories for easy transport and deployment including the padded case, screen protectors, and USB connectors. Specifications Minimum Breaking Strength 90 kN (20,232 lbf) Working Load Limit 30 kN (6,744 lbf) Scan Rate (Onboard / USB) Fast: 1,280 Hz; Slow: 640 Hz Scan Rate (Bluetooth) Fast: 40 Hz; Slow: 10 Hz Measuring Accuracy +/-0.75%; +/-0.5% at 3-15 kN Display Units kgf / lbf / kN (Digit Height: 2 cm) Storage Capacity 50 hrs of logs; 230 million data points Operating Endurance 50+ hrs in powersave; 20 hrs Bluetooth Operating Temperature 0-40 C (32-104 f); tested to -10 to 50 C Battery Type 3.7V 1600 mAh Lithium Polymer Protection Class IP68-0.1 (waterproof to 0.1 m for 1hr) Body Material High strain aviation aluminum LY12CZ Dimensions (L x W x H) 19 x 9 x 2 cm (7.5 x 3.5 x .8 in) Load Eyes 5.8 x 3.7 cm (R28 D-Shape) Comes Fully Equipped LineScale 3i Load Cell Plastic Tough-Case w/ Padding Rubber Edge & Screen Protector Anti-Glare Screen Protector 4 GB Dual-USB Flash Drive 7 CM Micro-USB Adapter Cable Firmware Upgrade Dongle Quick Start Guide & Manual Purchase Accessories & Spart Parts Here Certifications CE PPE certified in compliance with Regulation (EU) 2016/425 Recommended for use according to PPE-R/11.114 V3:2021 Issued by VG11 (Protection against falls from a height) UIAA UIAA 130 V1:2021 safety label for load-sharing devices Download the certification documents from the LineGrip website Software Download the free app from the LineGrip website (iOS & Android) Coming soon – high speed USB live logging direct to computer More Information Need to replace anything in your LineScale kit? See our spare parts. Have LineScale questions? Search the Knowledge Base for answers! Have a repair or warranty concern? Fill out our RMA Form to get started. For orders/services in Europe, please contact LineGrip in Germany. For orders/services in Australia, please contact Southern Cross in Sydney. From the Field “The LineScale 3i is a tremendous improvement to my gear, my systems testing for research, and my tool kit for teaching. It has a ton of features and settings that just weren’t available at the price point previously. Some of my favorite things about it are the massive omni-directional collection points that accommodate a variety of rigging configurations, the internal data storage, reliable Bluetooth (and a great app to accompany it!), and its high resolution and measurement range. I have abused my LineScale for 3 years, and it’s held up great.” –Justin Wheaton, CMC School Instructor NAME WEIGHT COLOR DIMENSIONS CERTIFICATIONS MBS WLL LOAD CELL, LINESCALE 3I 530 G (1.17 LB) GRAY 19 X 9 X 2 CM (7.5 X 3.5 X .8 IN) CE PPE-R/11.114 V3:2021; UIAA 130 V1:2021 90 KN (20,232 LBF) 30 KN (6,744 LBF)
