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The Listo 1620 Mechanical Chinagraph Pencil is the professional choice for marking on non-porous surfaces in site investigation and field engineering work. Unlike traditional wooden chinagraph pencils, the mechanical barrel eliminates the need for sharpening — simply twist to advance the lead. No more broken points, no shavings in your sample bags, and no wasted material.

Chinagraph pencils write on virtually any surface — glass, plastic, metal, polythene sample bags, core boxes, trial pit marker pegs, and geotechnical photo boards. The waxy, oil-based lead is weather resistant and remains legible in wet site conditions where a standard graphite pencil would smear or fade.

Supplied as a box of 12 pencils. Available in Black, Red, and Blue.

Key features:

• Mechanical barrel — twist to advance, no sharpening required
• Writes on non-porous surfaces — polythene, glass, metal, plastic
• Weather resistant — legible in wet and cold conditions
• Oil-based waxy lead — bold, clear marks
• Available in Black, Red, and Blue
• Box of 12 — ideal for equipping a full site investigation team

Typical applications:

• Labelling soil and rock sample bags directly
• Marking core box trays and sample containers
• Writing on polythene sheeting and plastic pegs
• Site photography reference marks
• General site marking on non-porous materials