CDHT Spring Tester
Compression Digital Hand Tester

Built to order. Standard lead time 3-4 weeks.

The CDHT (Compression Digital Hand Tester) can accommodate larger springs (up to 6” tall) and test with greater accuracy than our ECT (Electronic Compression Tester).

  • 11 lbf, 110 lbf & 750 lbf load capacities
  • Standard 6″ stroke
  • Up to 0.0005″ length resolution

Compression Digital Hand Tester

The CDHT (Compression Digital Hand Tester) can accommodate larger springs – up to 6” tall – and test with greater accuracy than our ECT (Electronic Compression Tester). In addition, this tester can be upgraded with useful options like the Micro-Length Adjust with length stop, USB / RS 232 ports, as well as single or double length stop rods. Force and length readings are displayed on a two-line LED screen in real time as values with indicator bars. As is the case with all our manual testers, the Compression Digital Hand Tester has built-in deflection compensation for accurate readings at all times. The CDHT is built on a rugged cast aluminum and steel frame, moves on a precision rack and pinion drive with adjustments for wear, and features convenient hand operation to apply force and adjust length. A standard length lock and mechanical overload stops help protect the tester from damage.

Micro Length Adjust
Make extremely fine length adjustments and utilize two rigid compression stops built right into the assembly (the hand operating lever has been removed in this photo).

LED Force / Length Display
Two-line LED display of force and length with indicator bars featuring built-in deflection compensation for accurate readings at all times.

CDHT Back View

Optional RS 232 / USB Data Output ports sit above the power supply input on the back of the tester.

Includes Length Deflection Compensation

What is length deflection compensation?
All force/length testing devices, regardless of manufacturer, have additional deflection by the load cell and tester frame which occurs as the spring is loaded. If you buy or use a tester without deflection compensation, measurements might include significant length errors.
Spring deflection, also known as spring travel or motion, is the action of a compression spring compressing (being pushed), an extension spring extending (being pulled), or a torsion spring winding (being twisted) when a load is applied or released. This is one characteristic (spring deflection) that is measured by a Larson Systems Spring Tester.

Larson Systems has built-in Length Deflection Compensation so that the user does not have to calculate and apply length corrections. Most competitors do not have length deflection compensation.

With a Larson Systems product, forget about calculating load cell and frame deflection when testing, we’ve got you covered.

SDC (Spring Data Collector) Software Demo

Try our software for “Spring Testing Data at Your Fingertips”. With Larson System’s SDC (Spring Data Collector) Software, your spring testing data can be accessed, stored and manipulated as it is generated. Store specifications for different parts, load a set of parameters and clearly see which springs are out of spec using the on-screen graphical representation of the testing results. Save and print results or open the results file in Microsoft Excel. You have complete control of your testing data.

Download Free Demo

Force Specifications

Load Cell
Standard Resolution High Resolution*
0-100% FS 0-20% FS 20-100% FS
11 lbf 0.005 lbf 0.0005 lbf 0.005 lbf
5 kg 0.002 kg 0.0002 kg 0.002 kg
49 N 0.02 N 0.002 N 0.02 N
110 lbf 0.05 lbf 0.005 lbf 0.05 lbf
50 kg 0.02 kg 0.002 kg 0.02 kg
489 N 0.2 N 0.02 N 0.2 N
750 lbf 0.5 lbf 0.05 lbf 0.5 lbf
340 kg 0.2 kg 0.02 kg 0.2 kg
3,336 N 2 N 0.2 N 2 N
Accuracy = ± Full Scale Resolution x 2
*Requires High Resolution Force option 050-0000-0107-00

Parts and Accessories


DescriptionPart Number 
CDHT - 11 lbf Compression Digital Hand Tester050-0000-0055-00Get a Quote
CDHT - 110 lbf Compression Digital Hand Tester050-0000-0056-00Get a Quote
CDHT - 750 lbf Compression Digital Hand Tester050-0000-0057-00Get a Quote

Accuracy Options

DescriptionPart Number 
High Resolution Force (10X Resolution from 0-20% FS), DHT050-0000-0107-00Get a Quote
Digital Length Precision Upgrade (0.0005 Res, ± 0.001 Acc)025-0000-0488-00Get a Quote

Factory Options

DescriptionPart Number 
Micro Length Adjust with Built-in Stops (CDHT, DHT)025-0000-0407-02Get a Quote
MicroAdjust Wrenchless Stop Assembly025-0000-0676-00Get a Quote
RS232 / USB output, DHT Family050-1000-0064-00Get a Quote


DescriptionPart Number 
Solid Height (Coil Bind) Protection Plate - 2" Ø platorms018-0000-4358-00View Product
Platforms - 4" Ø (Pair for 5/16-18 Mount)025-0000-0191-00Get a Quote
Thru-Rod Support Kit (1/16 to 1/8" Ø x 6")025-0000-0225-00Get a Quote
4" Ø Platform / Thru-Rod Support Kit (1/16 to 11/16" Ø ID x 8")025-0000-0485-00Get a Quote
Set of 2" Spring Platforms (HT Tool Steel, No Hole)025-0000-1597-00Get a Quote
Single Stop Rod025-0000-0293-00Get a Quote
Double Stop Rods025-0000-0333-00Get a Quote
NiCad Rechargeable Battery (4-8 hr life)025-0000-0294-00Get a Quote
Dust Cover - ECT, CDHT, CDHT w/Microadjust059-1000-0026-00Get a Quote
Vibration Damping Pad025-0000-0226-00Get a Quote
Air Vibration Damping Table025-0000-0288-00Get a Quote
Rubber Mounting Foot Upgrade025-0000-1310-00Get a Quote

Software Options

DescriptionPart Number 
SSS - Statistical & Spreadsheet Interface Software050-0000-0075-00View SSS Product
Spring Data Collector Software (for use with DHT family testers) 050-1000-0060-01View SDC Product

Power Supplies

DescriptionPart Number 
Power Supply, 100-240 VAC 50-60 Hz (USA Plug)025-1000-0396-00View SSS Product
Power Supply, 100-240 VAC 50-60 Hz (International Plugs)025-1000-0396-04View SDC Product