Use this tester for tension or compression applications. Standard pull lengths of 12” can be increased with optional extended rods to up to 18” to test long parts.
- Up to 18″ range (12″ standard)
- Standard 6″ stroke
- Up to 4″ Ø platform (2″ standard)
DHT +Plus
Digital Hand Tester +Plus
DHT +Plus – Digital Hand Tester
Use this tester for tension or compression applications. Standard pull lengths of 12” can be increased with optional extended rods to up to 18” to test long parts. It has higher resolution force and length to test with greater accuracy.
Additional Information
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.
Force Specifications
| Load Cell Capacity |
Standard Resolution* | ||
| 0-20% FS | 20-100% FS | ||
| 110 lb | 0.005 lb | 0.05 lb | |
| 50 kg | 0.002 kg | 0.02 kg | |
| 489 N | 0.02 N | 0.2 N | |
| 750 lb | 0.05 lb | 0.5 lb | |
| 340 kg | 0.02 kg | 0.2 kg | |
| 3,336 N | 0.2 N | 2 N | |
| Accuracy = ± Full Scale Resolution x 2 | |||
Parts and Accessories
Tester
| Description | Part Number | |
|---|---|---|
| DHT Plus 110 lb Digital Hand Tester | 050-0000-0021-02 | Get a Quote |
| DHT Plus 750 lb Digital Hand Tester | 050-0000-0021-01 | Get a Quote |
Accuracy and Factory Options
| Description | Part Number | |
|---|---|---|
| MicroAdjust Wrenchless Stop Assembly | 025-0000-0676-00 | Get a Quote |
Quick Release Range Adjust Handles (200 lb Max Load)
Quick Release Range Adjust HandlesPart Number: 025-0000-0412-00 Replace your socket head cap screws with these simple handles for quick and easy range adjusting on your tester. 200 lb maximum load. | 025-0000-0412-00 | Get a Quote |
| 23.200" Support Rods (18" Range) | 018-0000-0907-03 | Get a Quote |
| 23.600" Support Rods (18" Range) | 018-0000-1563-01 | Get a Quote |
Accessories
| Description | Part Number | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Spring Button Platform - 1" Ø (Hardened steel) | 018-0000-0914-01 | Get a Quote | ||||||||||||||
Platforms - 4" Ø (Pair for 5/16-18 Mount)
Platforms – 4″ ØPart Number: 025-0000-0191-00 For testing larger diameter compression parts. | 025-0000-0191-00 | Get a Quote | ||||||||||||||
Thru-Rod Support Kit (1/16 to 1/8" Ø x 6")
Thru-Rod Support Kit (1/16 to 1/8″ Ø x 6″)Part Number: 025-0000-0225-00 Includes rods: 1/16, 3/32 & 1/8″ Ø x 4″ long, accompanying plates with matching holes, as well as upper and lower plates without holes. | 025-0000-0225-00 | Get a Quote | ||||||||||||||
4" Ø Platform / Thru-Rod Support Kit (1/16 to 11/16" Ø ID x 8")4″ Ø Platform / Thru-Rod Support Kit (1/16 to 11/16″ Ø ID x 8″)
Part Number: 025-0000-0485-00 This kit is more flexible than other thru-rod options and can accommodate larger thru-rods. In addition, springs up to 4″ in diameter can be tested with the over-size platforms. Includes rods: 1/16″ to 11/16″ x 8″ long, and accompanying plates with matching holes. 4″ Ø plate can double for testing springs with larger diameter. NOTE: Deflection compensation is calibrated at the center of the platforms. The length error would vary depending on the load and the location of the load. A centered load is always best and will read accurately, to within ± 0.001″ (0.025 mm) of the actual length. A large off-center load near the edge of the extended platform may be off by up to 0.008″ (0.2 mm). Installation & Use 
| 025-0000-0485-00 | Get a Quote | ||||||||||||||
Extension Setup Blocks
Setup BlocksPart Number: 025-0000-0190-00 For compression / extension length zeroing. 12″ extension zeroing; 10″ compression zeroing. | 025-0000-0190-00 | Get a Quote | ||||||||||||||
Extension Spring Swivel Wire Hook - 2 lb cap (0.030" Ø wire)
Wire Extension Hooks – 2 lb max (0.030″ Ø)Part Number: 025-0000-0340-05 Medium duty hooks for your extension testing. | 025-0000-0340-05 | Get a Quote | ||||||||||||||
Extension Spring Swivel Wire Hook - 2 lb cap (0.050" Ø wire)
Wire Extension Hooks – 2 lb max (0.050″ Ø)Part Number: 025-0000-0340-06 Medium duty hooks for your extension testing. | 025-0000-0340-06 | Get a Quote | ||||||||||||||
Pin Extension Hooks
Pin Extension HooksLight duty hooks for your extension testing. The above pictures show 025-0000-0250-05 (including the swivel mount).
| 025-0000-0250-04 | Get a Quote | ||||||||||||||
| Wire Extension Hooks - 10 lb max (1/16" Ø wire) | 025-0000-0340-01 | Get a Quote | ||||||||||||||
| Wire Extension Hooks - 66 lb max (3/32" Ø wire) | 025-0000-0340-02 | Get a Quote | ||||||||||||||
| Wire Extension Hooks - 110 lb max (1/8" Ø wire) | 025-0000-0340-00 | Get a Quote | ||||||||||||||
| Wire Extension Hook Set - 10 / 66 110 lb max. Includes protective carrying and storage case. | 025-0000-0340-03 | Get a Quote | ||||||||||||||
| Wire Extension Hooks - 1,000 lb max (5/16" Ø wire) | 025-0000-0514-00 | Get a Quote | ||||||||||||||
Wire Extension Hooks
Wire Extension HooksPart Number: 025-0000-0523-00 Medium duty hooks for extension testing. Protective carrying and storage case included with sets.
| 025-0000-0523-00 | Get a Quote | ||||||||||||||
Machined Extension Hooks
Machined Extension HooksPart Number: 025-0000-0181-00 Heavy duty hooks for your extension testing.
| 025-0000-0181-00 | Get a Quote | ||||||||||||||
Wire Crimp Pull Fixture - Upper, 1/32 to 7/16 slot width
Wire Crimp Pull Fixture – UpperPart Number: 025-0000-0271-00 Test your wire crimp’s integrity with LSI’s wire crimp fixtures. The upper pull fixture features 18 slots ranging from 0.031″ to 0.437″ and can accommodate up to #4 gage wire. Choose between 110 and 1,000 lb lower grip fixtures. | 025-0000-0271-00 | Get a Quote | ||||||||||||||
Wire Crimp Grip Fixture - Lower 110 lb
Wire Crimp Pull Fixture – LowerPart Number: 025-0000-0274-00 Test your wire crimp’s integrity with LSI’s wire crimp fixtures. The upper pull fixture features 18 slots ranging from 0.031″ to 0.437″ and can accommodate up to #4 gage wire. Choose between 110 and 1,000 lb lower grip fixtures. | 025-0000-0274-00 | Get a Quote | ||||||||||||||
Wire Crimp Grip Fixture - Lower 1,000 lb
Wire Crimp Pull Fixture – LowerPart Number: 025-0000-0272-00 Test your wire crimp’s integrity with LSI’s wire crimp fixtures. The upper pull fixture features 18 slots ranging from 0.031″ to 0.437″ and can accommodate up to #4 gage wire. Choose between 110 and 1,000 lb lower grip fixtures. | 025-0000-0272-00 | Get a Quote | ||||||||||||||
Smooth Jaw Wire Chucks - 100 lb
Wire ChucksPart Number: 025-0000-0193-00 For extension wire breakage testing: accepts 0.020″ to 0.312″ Ø wire. | 025-0000-0193-00 | Get a Quote | ||||||||||||||
Serrated Jaw Wire Chucks - 200 lb
Wire ChucksPart Number: 025-0000-0193-01 For extension wire breakage testing: accepts 0.020″ to 0.312″ Ø wire. | 025-0000-0193-01 | Get a Quote | ||||||||||||||
Smooth Jaw Wire Chucks - 400 lb
Wire ChucksPart Number: 025-0000-0193-02 For extension wire breakage testing: accepts 0.020″ to 0.312″ Ø wire. | 025-0000-0193-02 | Get a Quote | ||||||||||||||
Air Vibration Damping Table
Air Vibration Damping TablePart Number: 025-0000-0288-00 The Air Vibration Damping Table allows you to make very accurate force measurements in normal industrial environments that have floor or building transmitted vibrations. These vibrations may be induced by industrial equipment, local car, truck or rail traffic and in some cases by people walking by. The Air Vibration Damping Table reduces the magnitude of vibration by 10 to 100 times, making it possible to accurately measure forces at very light loads in environments that would otherwise be impossible. The table should be considered for applications with forces less than 10 lb and is highly recommended for applications with forces less than 2 lb. Air Vibration Damping Table Setup:
| 025-0000-0288-00 | Get a Quote | ||||||||||||||
Vibration Damping Pad
Vibration Damping PadPart Number: 025-0000-0226-00 Foam Vibration Damping Pad | 025-0000-0226-00 | Get a Quote | ||||||||||||||
5/16-18 M to 10-32 M/F Thread Adapter
Thread AdaptersPart Number: 018-0000-1718-00 Use differently threaded attachments with your Larson tester. | 018-0000-1718-00 | Get a Quote | ||||||||||||||
5/16-18 M to M6 M/F Thread Adapter
Thread AdaptersPart Number: 018-0000-1718-01 Use differently threaded attachments with your Larson tester. | 018-0000-1718-01 | Get a Quote | ||||||||||||||
5/16-18 M to M4 M/F Thread Adapter
Thread AdaptersPart Number: 018-0000-1718-02 Use differently threaded attachments with your Larson tester. | 018-0000-1718-02 | Get a Quote | ||||||||||||||
Dust Cover - 12" Range Rods
Dust CoverPart Number: 059-1000-0004-00 | 059-1000-0004-00 | View Product | ||||||||||||||
Dust Cover - 18" Range Rods
Dust CoverPart Number: 059-1000-0012-00 | 059-1000-0012-00 | Get a Quote | ||||||||||||||
TUL - Twist Under Load
Twist Under LoadPart Number: 050-0000-0099-00 Graduated Markers Capacity Captivated Ball Bearings Universal Mounting (excluding the Flash 11 & Flash 24) | 050-0000-0099-00 | Get a Quote | ||||||||||||||
| Small Parts Catcher for 2" diameter platforms | 018-0000-4228-00 | Get a Quote | ||||||||||||||
| Rubber Mounting Foot Upgrade | 025-0000-1310-00 | Get a Quote | ||||||||||||||
| Solid Height (Coil Bind) Protector - 2" | 018-0000-4358-00 | View Product |
Software
| Description | Part Number | |
|---|---|---|
| SSS - Statistical & Spreadsheet Interface Software Total Spring Inspection | 050-0000-0075-00 | Get a Quote |
| Spring Data Collector Software Force@Length Data at Your Fingertips! | 050-1000-0060-01 | Get a Quote |
Power Supplies
| Description | Part Number | |
|---|---|---|
| Power Supply, 100-240 VAC 50-60 Hz (USA Plug) | 025-1000-0396-00 | Get a Quote |
| Power Supply, 100-240 VAC 50-60 Hz (International Plugs) | 025-1000-0396-04 | Get a Quote |