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GIVE YOURSELF A HAND. Working as a pair, the Gecko Gauge clamps to each siding course, acting as a second set of hands to gauge and support the next course for nailing. Get fast, accurate one-person installation with less fatigue and with virtually no layout. Every Gecko Gauge uses a patented friction-cam mechanism for incredible holding power to fully support up to 16’siding lengths. Our SA903 models feature a non-marring design – great for primed and pre-painted siding, while our SA902 models are made with ultra-durable aluminum and recommended for pried (non-painted) siding only. Gecko Gauge is recognized as the fastest and simplest fiber-cement siding tool. Take your siding installation to the next level with the Gecko Gauge!