DHT Spring Tester
Digital Hand Tester

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

Use the DHT for tension or compression testing applications. Standard pull lengths of 12” can be increased with optional extended rods to up to 18” to test longer parts.

  • Up to 18″ range (12″ standard)
  • Standard 6″ stroke
  • Up to 4″ Ø platforms (2″ Ø standard)

DHT – Digital Hand Tester

Use the DHT for tension or compression testing applications. Standard pull lengths of 12” can be increased with optional extended rods to up to 18” to test longer parts. The Digital Hand Tester has higher resolution force and length to test with greater accuracy than our ECT (Electronic Compression Tester) and CDHT (Compression Digital Hand Tester). In addition, this tester can be upgraded with useful options like the Micro-Length Adjust with length stops or USB / RS 232 ports.

The DHT displays force and length readings on a two-line LED screen in real time as values with indicator bars. Like all of our manually-operated spring testers, the DHT has built-in deflection compensation for accurate readings at all times. Built on a rugged cast aluminum and steel frame, the Digital Hand Tester has a precision rack and pinion drive with adjustments for wear and features convenient hand operation to apply force and adjust length. Lastly, the DHT includes 2 position stop rods, a standard length lock, a rechargeable battery and mechanical overload stops to protect the tester from damage.

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
2 lbf 0.001 lbf 0.0001 lbf 0.001 lbf
907 g 0.2 g 0.02 g 0.2 g
8.9 N 0.002 N 0.0002 N 0.002 N
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 
DHT - 2 lbf Digital Hand Tester050-0000-0025-00Get a Quote
DHT - 11 lbf Digital Hand Tester050-0000-0019-00Get a Quote
DHT - 110 lbf Digital Hand Tester050-0000-0020-00Get a Quote
DHT - 750 lbf Digital Hand Tester050-0000-0021-00Get a Quote

Accuracy and Factory Options

DescriptionPart Number 
High Resolution Force (10X Resolution from 0-20% FS)050-0000-0107-00Get a Quote
Digital Length Precision Upgrade (0.0005 Res, ± 0.001 Acc)025-0000-0488-00Get a Quote
Micro Length Adjust with Built-in Stops025-0000-0407-02Get a Quote
MicroAdjust Wrenchless Stop Assembly025-0000-0676-00Get a Quote
Quick Release Range Adjust Handles (200 lbf Max Load)025-0000-0412-00Get a Quote
RS232 / USB output050-1000-0064-00Get a Quote
23.200" Support Rods (18" Range)018-0000-0907-03Get a Quote


DescriptionPart Number 
Spring Button Platform - 1" Ø (Hardened steel)018-0000-0914-01Get a Quote
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
Extension Setup Blocks025-0000-0190-00Get a Quote
Extension Spring Swivel Wire Hook - 2 lb cap (0.030" Ø wire)025-0000-0340-05Get a Quote
Extension Spring Swivel Wire Hook - 2 lb cap (0.050" Ø wire)025-0000-0340-06Get a Quote
Pin Extension Hooks025-0000-0250-04Get a Quote
Wire Extension Hooks - 10 lb max (1/16" Ø wire)025-0000-0340-01Get a Quote
Wire Extension Hooks - 66 lb max (3/32" Ø wire)025-0000-0340-02Get a Quote
Wire Extension Hooks - 110 lb max (1/8" Ø wire)025-0000-0340-00Get a Quote
Wire Extension Hook Set - 10 / 66 / 110 lb max. Includes protective carrying and storage case.025-0000-0340-03Get a Quote
Wire Extension Hooks - 1,000 lb max (5/16" Ø wire)025-0000-0514-00Get a Quote
Wire Extension Hooks025-0000-0523-00Get a Quote
Machined Extension Hooks025-0000-0181-00Get a Quote
Wire Crimp Pull Fixture - Upper, 1/32 to 7/16 slot width025-0000-0271-00Get a Quote
Wire Crimp Grip Fixture - Lower 110 lb025-0000-0274-00Get a Quote
Wire Crimp Grip Fixture - Lower 1,000 lb025-0000-0272-00Get a Quote
Smooth Jaw Wire Chucks - 100 lb025-0000-0193-00Get a Quote
Serrated Jaw Wire Chucks - 200 lb025-0000-0193-01Get a Quote
Smooth Jaw Wire Chucks - 400 lb025-0000-0193-02Get a Quote
Air Vibration Damping Table025-0000-0288-00Get a Quote
Vibration Damping Pad025-0000-0226-00Get a Quote
5/16-18 M to 10-32 M/F Thread Adapter018-0000-1718-00Get a Quote
5/16-18 M to M6 M/F Thread Adapter018-0000-1718-01Get a Quote
5/16-18 M to M4 M/F Thread Adapter018-0000-1718-02View Product
Dust Cover - 12" Range Rods059-1000-0004-00View Product
Dust Cover - 18" Range Rods059-1000-0012-00Get a Quote
TUL - Twist Under Load050-0000-0099-00Get a Quote
Small Parts Catcher for 2" diameter platforms018-0000-4228-00Get a Quote
Rubber Mounting Foot Upgrade025-0000-1310-00Get a Quote
Solid Height (Coil Bind) Protector - 2" 018-0000-4358-00View Product


DescriptionPart Number 
SSS - Statistical & Spreadsheet Interface Software050-0000-0075-00Get a Quote
Spring Data Collector Software 050-1000-0060-01Get a Quote

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