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Email: info@tbtscietech.com  /  toni_gu@tbt-scietech.com

Light WEight Defelectometer

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TBTLWD-1G handheld light weight deflectometer is used to determine the deflection of subgrade under dynamic loading, further to evaluate the bearing capacity and deformation of subgrade. It is suitable to inspect construction foundation for railways, highways, airports, urban transportation, ports, docks and industrial & civil buildings under dynamic loading, especially suitable for inspecting narrow areas such as road-bridge (culvert) transition sections and road berm, or subgrage for existing railway or road. It can quickly measure the dynamic deformation modulus Evd value.

  • TBTLWD-1G (wire type)

Related Standard:

TB10102-2010 , TB10414-2003


Main features:

Imported sensors & components grants high test accuracy.
LCD display with prompts.
Operation is simple, test speed is fast as 35 seconds for one point.
The Evd value is automatically calculated with curve display, which is accurate and intuitive.
Hand-held host, equipped with Bluetooth mini printer, directly print on site.
USB interface connects with computer.
It simulates high-speed train running impact on roadbed, comparing with static loading test, it can show actual stress on subgrade soil.

With voice prompt for convenient operation.

Technical specification:

With 1 geophone sensor, can only test EVD modulus

Test range

Applicable soil type

Soil, soil-rock mixture at particle size ≤ 1/4 of the diameter of loading plate

Test range

Evd :  10Mpa≤Evd≤225Mpa

Test impact depth


working environment

temperature -10℃40℃   humidity 90%HR

Data acquisition device

Loading device

With 1 geophone sensor

Weight: 15kg, including hammer 10kg.

Hammer falling height: 700±20mm
Maximum impact force: 7.07kN
Impact duration: 18±1ms

Loading Plate




Handheld host

Settlement test range



2000 groups of data


screen size:3"   



Power supply

Large-capacity lithium battery, for more than 18 hours

Display mode

screen display switch forChinese/ English

Data transmission




Wireless Bluetooth for printing


Packing case

Inside case Material: Engineering Plastic

420x140x335mm at 4.5kg

Outside case: Aluminum alloy case

1220x395x380mm at 56KG

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​Tel: +86-25-8472-1577 / 8472-1579
Fax: +86-25-8472-2235
Email: info@tbtscietech.com
Add: Rm. 1001~1002 HuaXia Mansion, No.81 ZhongShan
Rd., NJ 210005 PR China
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