Valve Spring Tester

LSI’s Valve Spring Tester will be an indispensable part of your engine maintenance. View force and length test readings on the bright, two-line LED display and have absolute confidence in the accuracy of your tests thanks to built in deflection compensation.

  • Compression testing of force and length
  • Standard 5″ range
  • Standard 0.001″ length resolution

Valve Spring Tester

We have high precision valve spring testers that are ideal for valve springs used in go-kart or snowmobile engines all the way up to nitro injected top fuel engines.

This is an inexpensive tester with full features. 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, 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.

Valve Spring Tester Demo

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
200 lb 0.1 lb
91 kg 0.05 kg
890 N 0.5 N
750 lb 0.5 lb
340 kg 0.2 kg
3,336 N 2 N
1,500 lb 1 lb
680 kg 0.5 kg
6,672 N 5 N
Accuracy = ± Full Scale Resolution x 2

Parts and Accessories


DescriptionPart Number 
V200 - 200 lb Valve Spring Tester050-0000-0109-04Get a Quote
V750 - 750 lb Valve Spring Tester050-0000-0109-02Get a Quote
V1500 - 1,500 lb Valve Spring Tester050-0000-0109-03Get a Quote

Factory Options

DescriptionPart Number 
RS232 / USB ouput, DHT Family050-1000-0064-00Get a Quote


DescriptionPart Number 
Thru-Rod Support Kit (1/16 to 1/8" Ø x 6")025-0000-0225-00Get a Quote
4" Ø Platforms / Thru-Rod Support Kit (1/16 to 11/16" Ø ID x 8")025-0000-0485-00Get a Quote
Platforms - 4" Ø (Pair for 5/16-18 Mount)025-0000-0191-00Get 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 Rod025-0000-0333-00Get a Quote
NiCad Rechargeable Battery (4-8 hr life)025-0000-0294-00Get a Quote
Dust Cover - 5" Range Rods059-1000-0026-00Get a Quote
Travelling Case025-0000-0487-03Get a Quote
8 Piece Valve Spring Retainer Set025-0000-0783-00Get a Quote
Rubber Mounting Foot Upgrade025-0000-0464-02Get a Quote
Solid Height (Coil Bind) Protector - 2" Hand Testers025-0000-0458-00Get a Quote

RS 232 Options

DescriptionPart Number 
Ink Jet Printer (includes Parallel to 9pin RS 232 Adapter Cable)025-0000-0464-02Get a Quote
RS 232 to Parallel Printer Cable / Adapter (DB9)025-0000-0458-01Get a Quote

Software Options

DescriptionPart Number 
SSS - Statistical & Spreadsheet Interface Software050-0000-0075-00Get a Quote
Excel Templates for Valve Spring Set Building and Certification050-0000-0140-00Get a Quote
Spring Data Collector Software (for use with DHT family testers)050-1000-0060-00Get 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

NIST Traceable Calibration Certificate

DescriptionPart Number 
NIST Traceable Calibration Certificate100-1000-003-05Get a Quote