Skip to content
Shop Your Local Store Ship to Your Hometown Store
Pro & Contractor Accounts Apply for Net Terms
100,000+ Products Trusted Authentic Brands

PacTool Gecko Gauge 8 in. X 5/16 in. D Fiber Cement Siding Tool 2 pk

Clamp-on siding gauges that hold your reveal line steady so every fiber cement board goes up even, sold as a matched pair.
Pactool MPN SA903 In Stock & Ready to Ship
$89.99
Free shipping on orders over $75
Ships within 24 hours · most orders arrive in about 2 business days

About Product Overview

The Gecko Gauge Side TL 5/16" from PacTool is a siding gauge built for hanging fiber cement siding with consistent reveal and less guesswork. Instead of measuring and re-checking every board, the gauge clamps onto the siding and holds your spacing steady while you nail off each course, so the reveal lines stay even from one end of the wall to the other.

It's sold as a pair, which matters on this job—one gauge on each end of the board keeps the whole run level while you work across it, rather than fighting to hold a single reference point. The 5/16" throat depth and clamping capacity are matched to fiber cement siding profiles, and the plastic housing keeps the tool light enough to move quickly board to board without adding fatigue to a long day of installs. Built for pros and serious DIYers tackling a full fiber cement siding job where speed and consistent spacing both matter.

  • Brand: PacTool, Sub-Brand: Gecko Gauge
  • Style: Fiber Cement Siding Tool
  • Throat Depth: 5/16"
  • Clamping Capacity: 8
  • Material: Plastic
  • Number in Package: 2

The Details Specifications

Brand Pactool
Model / MPN SA903
UPC 645646903003
Weight 1 lbs
Safety Data Sheet (SDS) Manufacturer documentation · opens in new tab
Price check

Go ahead. Check.

You're going to price-check us against Amazon, Home Depot, and Lowe's. Everybody does. Good — open all three tabs. We'll wait. Then look hard at what you're actually being handed over there.

On Amazon, start with these four questions before you click buy.

01

Who's actually selling it

The brand name is on the listing. A different company is in the seller field. Those aren't the same thing, and the second one is who you're buying from.

02

Whether the warranty survives

Most manufacturers only honor a warranty when the unit came through an authorized dealer. We're authorized for Pactool. A third-party marketplace seller usually isn't.

03

Where the box came from

Gray-market stock, returns repackaged as new, and outright fakes move through marketplaces constantly. It all looks identical in the photo. It stops looking identical when it fails.

04

Who you call when it breaks

Ours is a phone number with a person behind it who has held this product. M–F, 6 AM – 5 PM Pacific. (866) 469-8556

The big boxes don't care if your hardware store survives.

Amazon, Home Depot, and Lowe's are built to pull every hardware dollar out of your town. When the local shop can't keep the lights on, the counter where somebody actually knew which part you needed goes with it. We're built the other way: real brands so you're never stuck on a marketplace, and a straight answer to buy it down the street when that's the better call. Support independent hardware — it doesn't restock itself.

Why we tell you to shop local
Authorized dealer · Pactool

Or skip the tabs entirely and buy it down the street. Find a store near you →

Shop Local · Support Independent

Every order helps keep your local hardware store on the corner.

Why we built NHG
You might find it for less locally. Independent retailers often offer competitive pricing — some products are even cheaper in-store than online.
Real expert advice — not search results. Independent hardware staff know their inventory and the local conditions you're working in.
Keep the neighborhood working. Every dollar spent at an independent retailer returns roughly 3x more to your local economy than at a national chain.

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare