Scala Extension Rods are available in standard or heavy-duty models (to be used with our standard Scala Kit or heavy-duty Scala Kit respectively). They come in a variety of lengths (1 m, 1.2 m, 1.3 m and 1.5 m) and stamped versions are available (with numbers stamped every 100 mm). All Scala Extension Rods are graduated every 50 mm and have 1/2″ x 5/8″ threads. The heavy-duty models are made from higher tensile steel than the standard models. Rods are interchangeable, meaning if a breakage occurs onsite you can keep on testing with your remaining rods. If you need greater depth, additional rods are available to purchase (note that couplings are required to connect rods – these are sold separately).