Thien Nam Subsea Service Jsc

The LAM gauge has been designed specifically for measuring depth and angle for remedial weld grinding. Developed by a commercial diver-inspector in conjunction with TWI, the LAM gauge is invaluable for both underwater and topside use.

It provides linear measurements up to 40mm deep and angular measurements of up to 65°.

Although designed specifically for taking grinding measurements, the LAM gauge is a versatile, multi-purpose instrument capable of providing many frequently needed measurements. These include:

  • Welding grinding depth and angle
  • Pitting depth
  • Angle of preparation
  • Misalignment
  • Fillet weld leg length          
  • Fillet weld throat
  • Excess weld metal
  • Undercut
  • Indentations
  • Protrusions
  • Profile of damaged areas in members (using a steel straight edge)
  • Checking excavation depth in weld repairs
  • Linear measurement parallel to member surface, e.g. root gap
  • Measurements can be taken from flat or curved surfaces

The LAM gauge comes complete with:

  • An easy-to-follow instructions leaflet
  • Cosine conversion tables for flat and curved surfaces
  • Pictorial diagrams showing other uses
  • A heavy-duty protective plastic case for ease of storage/transportation



  • No 9, Pham Van Nghi Street, Thang Nhat Ward, Vung Tau City
  • +84 2543 513 134
  • +84 2543 513 135
  • This email address is being protected from spambots. You need JavaScript enabled to view it.


Thien Nam Subsea Services Joint Stock Company (TNS) is one of the most prestigious companies that specializes in providing diving services in Vietnam. We have many Diving supervisor, Data recorder, Diving inspector and Diver. Who was trained in prestigious vocational school as Petrovietnam Manpower Training College (PVMTC), trained and certificate... Read more