Compression Digital Hand Tester

Built to order. Standard lead time 2-3 weeks.

This tester can accommodate larger springs (up to 6” tall) and test with greater accuracy than our ECT.

  • 11 – 750lb load capacity
  • Standard 6″ stroke
  • Up to .0005″ length resolution

Compression Digital Hand Tester

This tester can accommodate larger springs (up to 6” tall) and test with greater accuracy than our ECT. In addition, this tester is upgradeable with more options like the Micro-Length Adjust with length stops, an RS 232 port or single or double length stops. The tester has a two-line backlit LED display of force and length and has deflection compensation for accurate readings at all times. It has a rugged cast aluminum and steel frame, a precision rack and pinion drive with adjustments for wear, and convenient hand operation to apply force and adjust length. It includes standard length lock and mechanical overload stops to protect the tester from damage.




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

LED Force / Length Display
Two-line LED display of force and length and has deflection compensation for accurate readings.

CDHT Back View

RS 232 and USB Data Output ports







Includes Length Deflection Compensation

What is length deflection compensation?
All force/lengh 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/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 Software Demo

Try our software for “Spring Testing Data at Your Fingertips”. With Larson System’s SDC 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.

Free Demo

Force Specifications

Load Cell
Standard Resolution High Resolution*
0-100% FS 0-20% FS 20-100% FS
11 lb 0.005 lb 0.0005 lb 0.005 lb
5 kg 0.002 kg 0.0002 kg 0.002 kg
49 N 0.02 N 0.002 N 0.02 N
110 lb 0.05 lb 0.005 lb 0.05 lb
50 kg 0.02 kg 0.002 kg 0.02 kg
489 N 0.2 N 0.02 N 0.2 N
750 lb 0.5 lb 0.05 lb 0.5 lb
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 lb Compression Digital Hand Tester050-0000-0055-00Get a Quote
CDHT - 110 lb Compression Digital Hand Tester050-0000-0056-00Get a Quote
CDHT - 750 lb 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
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

RS 232 Options

DescriptionPart Number 
Inkjet Printer (Includes Cable / Adapter 025-0000-0458-00)025-0000-0464-02Get a Quote
RS 232 to Parallel Printer Cable / Adapter025-0000-0458-01Get 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)025-1000-0396-00Get a Quote
Power Supply, 100-240 VAC 50-60 Hz (International Plugs)025-1000-0396-04Get a Quote