lineGrip lineScale 2

A digital bluetooth dyno / dynamometer / load cell specifically designed for measuring slackline tension up to 30kN (3 tons). The huge load eyes and 80kN breaking strength make it perfectly suited as a rigging plate / master point for highlines.

Shop for a lineScale now

lineGrip lineScale-2 Batch2 dyno load cell

This is a discontinued, out of stock 2019 model!
This page is archived here as reference for previous buyers and owners.

Show me the current model LineScale-3

Development, production, and finally getting all the little details right, took us almost one year (350 days to be exact).

But the wait, patience, and persistence was well worth the while… this baby is truly perfection in every aspect!

On Monday Dec. 2nd 2019 at 1600 CET 98 lineScales are finally ready to be shipped to their owners.

Join the lineScale project group:

Hurry, theres only a few left of the first batch. Once these are sold out, new stock will not be available before May 2020!


> Get your lineScale today


The following outside pics are from our first field test day with the working pre-series sample. The last 3 pictures are taken with a 3D-printed lineScale-2 prototype model for demonstration- and case study purposes.

Key Specs

Working Load Limit (WLL) 30 kN (6600 lbf)
Min. Breaking Strength (MBS) 80 kN (17600 lbf)
Measure L  x W x H 190 x 90 x 20 mm
Size load eyes 60 x 40 mm (R30 D-Shape)
Weight (incl. battery) 495 g (17 oz)
Operating temperature 0° to +40° C (32° to 105° F)
Relative operating humidity 10% to 80% RH
Protection Class IP64

Electronic Specs

Measuring range -10 % to 110 % WLL
Display units kgf / lbf / kN
Maximum range 3000 kgf / 6600 lbf / 30 kN
Display division (resolution) 1 kg / 2 lbf / 0.01 kN
Measure error  ±0.5% (@3kN-15kN)
Sensor scan rate (cycle rate) Fast: 40 Hz (25 ms)
Slow: 10 Hz (100ms)
Battery 3.7V 1000 mAh rechargeable Lithium battery pack
Operating endurance ca. 48 hours continuous
(24h w. bluetooth enabled)
Charging port Micro-USB
Interface Bluetooth 4


Material body aviation aluminum alloy LY12CZ
Coloring anodized in brilliant copper-gold color
Manufacturing technology milled from solid block
Assembly Method adhesive sealed

Safety is Paramount

This device is milled out of one solid block of high-tensile aviation aluminum (LY12CZ), giving it a whopping 80kN MBS. In terms of safety this is the best deal you can get. Theres no bolts, screws, rings, pistons or joints that could possibly fail… this is the security of mind you need when leaving the scale in the highline rig while walking it! Independent break testing resulted in a mind blowing 110kN! (see below)

Working Principle

The lineScale works by the priciple of material micro deformation: Wikipedia – Strain Gauge

User Configurable

A threshold load value can be set in the Android and iOS app to sound an alarm when reached.
The displayed unit (kg, lb, kN) and the auto power off time can easily be selected and saved as preset by the user.

lineScale dyno - super versatile
lineScale dynanometer w. high accuracy
lineScale dyno dynanometer with bluetooth connectivity and smartphone app
lineScale dyno w. state of the art power management and bluetooth
lineGrip lineScale-2 Batch2 dyno load cell
lineScale-2 break testing HNTH