What is the gap testing the tool

The gap test indicator light shows a proper calibration of tool; when it crimps each fitting the light indicates a good crimp. I've been pleased with this tool and ease of operation. I've used it alot since I purchased it. all crimping tools should have a way to monitor a proper crimp. Some have a separate Go-no-Go gage. This tool shows proper crimp with the indicator light.

How can you determine which end of calibration tool to use for which size ring

I believe the instructions tell you what end to use.

Will this work with all pex pinch rings or a specific style?

This appears to work with the 1/2", 3/4" and 1" rings I used, the style with the little 'ear' on the side( pinch clamps). This is NOT for the rings that are smooth, what they call a 'crimp ring'.

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RYOBI18-Volt ONE+ Lithium-Ion Cordless PEX Tubing Clamp Tool (Tool Only) P660

RYOBI18-Volt ONE+ Lithium-Ion Cordless PEX Tubing Clamp Tool (Tool Only) P660

Product ID: 119663945

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Details

Brand
RYOBI
Color
Green
Blade Material
Alloy Steel
Surface Recommendation
Multiple
Power Source
Battery

💡Dual LED Workspace Lighting

🔋18V Lithium-Ion Power

🤏Fits All PEX Clamp Sizes

Description

⚡ Clamp smarter, not harder — power your PEX game with RYOBI!

ONE HANDED EFFICIENCY - Seamless one-touch activation lets you clamp with ease and speed.
POWER MEETS PRECISION - Industry’s first powered pinch clamp tool for flawless PEX connections every time.
LIGHTWEIGHT PORTABLE - Compact 4.59 lb design with belt clip keeps your tool ready wherever the job takes you.
UNIVERSAL COMPATIBILITY - Works effortlessly with all PEX clamp ring sizes from 3/8 in. to 1 in.
ILLUMINATE YOUR WORKFLOW - Dual LED lights ensure no detail is missed, even in dimly lit spaces.

The RYOBI 18-Volt ONE+ Lithium-Ion Cordless PEX Tubing Clamp Tool (P660) is the industry’s first powered pinch clamp tool designed for professional-grade PEX installations. Featuring 18V lithium-ion power, dual LED lights for enhanced visibility, and one-handed operation, it fits all PEX clamp ring sizes from 3/8 to 1 inch. Lightweight and portable, this bare tool (battery and charger sold separately) is engineered to boost efficiency and precision on every job site.

Specifications

Brand	RYOBI
Color	Green
Blade Material	Alloy Steel
Surface Recommendation	Multiple
Power Source	Battery Powered
Special Feature	Cordless
Included Components	Go/No-Go Gauge and Belt Clip
Voltage	18 Volts
Warranty Type	limited warranty
Item Weight	4.6 Pounds
Blade Length	1 Inches
Blade Shape	Rectangular
Handle Material	Plastic
UPC	033287177592
Manufacturer	Ryobi
Part Number	P660
Item Weight	4.59 pounds
Product Dimensions	12.68 x 5.39 x 3.58 inches
Item model number	#P660
Style	Box
Material	Plastic/Other
Item Package Quantity	1
Special Features	Cordless
Batteries Included?	No
Batteries Required?	No

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