This premium scale offers all the qualities of a traditional hanging balance with the simplicity, convenience and accuracy of digital operation.


  • High performance
  • Large, easy to read LCD display.
  • Pre-calibrated to factory specs
  • Easily re-calibrated as needed for long term accuracy.
  • “HOLD” feature for one person operation on heavier loads
  • Robust, compact, lightweight, and portable
  • Equipped with carrying pouch and frictionless hook and strap.
  • Auto power off to save on battery life


Spring pressure can have a dramatic effect on the life and performance of carbon brushes. As spring pressure lowers, the electrical wear rate of the brush increases.

In addition, very weak spring force can lead to bouncing and chatter of the brush on the riding surface. Inconsistent spring force can lead to selective action, increased dusting, chance for arcing, etc. This leads to increased maintenance and reduced brush life and can lead to damage to the machine.

Maintenance Tip:
Increase the life of your brushes by adding ‘Check Spring Pressure’ to your regular maintenance schedule. Detect issues with spring pressure before any damage is done to the brushes or motor.

To calculate Spring Pressure

Spring Pressure(P.S.I) = Measured Force(lbs) / Brush Thickness(in) x Width

spring pressue equation: spring pressure = measured force divided by (brush thinkness times brush width)


Refer to the chart below to calculate optimal spring force.

spring pressure graphic with total brush wear and spring pressure as the X/Y axis


On/Zero, off, hold, units


9v alkaline batter (included)


Tare, hold


(Switchable Unites – kg, lb, lb/oz) 10 kg x 0.01 kb (22 lb x 0.02 lb 1/4 oz)


(0.6″/15mm) 7 segment LCD


0° C to 40° C (32° to 104° F)


CE electromagnetic compatibility
EN 50081-1
EN 50082-1
(Tested to comply with FCC standards)

Industrial D.C Applications

4.0 – 6.0 P.S.I. (280-420 g/cm2)

WRIM & Sync. Rings

3.5 – 4.5 P.S.I. (240-310 g/cm2)

High Speed Turbine Rings Soft Graphite Grades

2.5 – 3.5 P.S.I. (170-240 g/cm2)

Metal Graphite Brushes

4.5 – 5.5 P.S.I. (310-390 g/cm2)

Fractional HP Brushes

4.0 – 7.0 P.S.I. (280-490 g/cm2)

Traction Brushes

5.0 – 8.0 P.S.I. (350-560 g/cm2)



Learn about how to
measure spring force

hydro example - water over dam

Quality Upgrades for Hydro Generators

Helwig offers high-quality upgrades and custom designs to hydro generators that will ensure superior performance in the field. These upgrades are in addition to the expertly engineered turbine brush holders, adjustable slip ring holders, and constant force springs that deliver maximum reliability.

teflon coated brush holders

Teflon Coated Brush Holders for Pickling Line

In the steel industry, pickling operations are used to remove surface oxides and clean rust or scale buildup. These operations are very important for the manufacture of steel, but they are notorious for their corrosive atmosphere.

Constant Force Spring Differences Blog Post - image of Helwig Carbon constant force springs

Carbon Brush Springs: Constant Force to Optimize Wear Rate

Carbon Brush Springs: What Our Research Says About Constant Force and Wear Rate Many times, carbon brush holders that claim to use constant force springs are actually not constant force at all.  A proper holder allows full spring force throughout a carbon brush’s life.  Most holders are poorly designed and fail to be “constant force” for two main reasons:

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