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. The clear digital display and Bluetooth connectivity provide instant feedback in the field, while the rugged build and included components make it easy to protect, transport, and deploy.

Engineered for performance and insight, LineScale 3i measures up to 1,280 samples per second—capturing peak loads with unmatched precision, even in dynamic events. Its on-board storage saves over 200 million data points and supports 50 hours of continuous operation. When it’s time for after-action review, the USB data transfer is quick and intuitive, simplifying analysis. With 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.

A next-level teaching tool and powerful addition to any rigging cache, LineScale 3i improves testing protocols, training outcomes, and decision-making for live operations. Read our blog on specific use cases for rescue, rope access, and training.

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.
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

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)

Features

Comes Fully Equipped

Certifications

Software

Anchor Devices

CMC Swivels Rescue

CMC Swivels ProSeries

CMC AZORP Quick-Release Replacement Pin

CMC Anchor Plate Stainless Steel

CMC MICRO-ANCHOR PLATE

CMC LineScale 3i Load Cell

CMC LineScale 3i Felt Protective Cover

CMC Anchor Plate Aluminum Red

CMC Enforcer Load Cell

CMC LineScale 3i Plastic Tough Case with Contour Cut Padding

CMC LineScale 3i Rubber Edge Protector & Screen Armor

CMC LineScale 3i Firmware Upgrade Dongle