Does this work on 12 inch siding

No, neither the SA902 nor SA903 work on 12" siding. There is a model SA902.12 that is made specifically for use on the 12". It is basically the model SA902 with a pair of long aluminum extensions included in the package. Since this model is made of aluminum it isn't recommended for use on the pre-finished siding as the aluminum tends to leave marks.

What makes this zone 10 specific?

http://www.jameshardie.com/dealer/hardiezone.shtml + http://www.jameshardie.com/homeowner/hardiezone-video.htmlThe Zone 1 - 5 product has a specific drip edge design and since this tool clamps at that edge, you use it on zone 6 - 10 products.

Would these work installing the big 0.312-in x 48-in x 96-in hardiepanel vertical fiber cement siding panels?

These are for panel siding … clamps to Z Flashing to hold up the panel. https://www.amazon.com/dp/B001PBJ6QM?tag=price125420e-20&ascsubtag=wtbs_60358245085322c828fd7606

Will this work with 1in by 8in cedar bevel ?

Probably not. It’s only for 5/16 siding

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🦎 Nail your siding game solo with the Gecko Gauge – precision meets power!

SOLO PRO EFFICIENCY - Install fiber-cement siding solo with zero layout hassle.
DURABLE DAMAGE FREE - Heavy-gauge plastic protects your pre-painted siding from scratches.
PRECISION ADJUSTABILITY - Fine-tune reveals from 4" to 8" in easy 1/4" steps.
OPTIMIZED FOR MODERN SIDING - Perfectly compatible with 5/16" fiber-cement, including James Hardie’s latest HZ5 series.
PATENTED FRICTION CAM POWER - Securely supports full 12-foot fiber cement boards with patented grip tech.

The PacTool SA903 Gecko Gauge is a 2-piece fiber cement siding tool designed for effortless one-person installation. Featuring an adjustable gauge with 1/4" increments for 4"-8" reveals and a patented friction-cam mechanism, it supports full 12-foot fiber cement boards without scratching pre-painted surfaces. Ideal for 5/16" fiber-cement siding, including James Hardie’s HZ5 series, this durable polycarbonate tool streamlines siding projects with professional precision.

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Manufacturer	General Tools & Instruments
Part number	SA903
Item Weight	590 g
Product Dimensions	30.48 x 30.48 x 40.64 cm; 589.67 g
Item model number	SA903
Size	1-Pack
Color	Green
Style	Gauge for 5/16\" fiber cement siding
Material	Plastic Polycarbonate (PC) Rubber
Pattern	Mounting Kit
Power source type	Hand Powered
Item Package Quantity	2
Measurement Accuracy	1
Included components	Gecko Gauges
Batteries Included?	No
Batteries Required?	No

PacTool Pacific International International SA903 2-Piece Gecko Gauge Hardi Board Siding Gauges

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