HARFINGTON Raised Grip Metal Ruler 100cm Metric Ruler Measure Aluminum Alloy Anti Slip Protective Ruler Straight Cutting Ruler Measuring Tool with Hanging Hole for Cutting Measuring, Blue Color:Blue A dual-action safety lock allows

A dual-action safety lock allows for the blade to be locked while in use or locked inside the handle when not in use

low-friction material that has smooth transfer

you can directly replace the old or damaged ones in the process of use

Use the brass bristles brushes to clean the unfinished metal parts without scratching the surfaces or fine features

Dual Measurement Capability: Measures both Peak Expiratory Flow (PEF) and Forced Expiratory Volume (FEV1) to provide comprehensive lung function assessment

HARFINGTON Raised Grip Metal Ruler 100cm Metric Ruler Measure Aluminum Alloy Anti Slip Protective Ruler Straight Cutting Ruler Measuring Tool with Hanging Hole for Cutting Measuring, Blue Color:Blue A dual-action safety lock allowsHARFINGTON Raised Grip Metal Ruler 100cm Metric Ruler Measure Aluminum Alloy Anti Slip Protective Ruler Straight Cutting Ruler Measuring Tool with Hanging Hole for Cutting Measuring, Blue Product Features Size Measuring Range: 100cm. System: Metric. Precision: 1mm. Width: 35mm. Thickness: 12. 5mm. Scale printing is clear and more convenient to read. Material Made of aluminum alloy with oxidation treatment for corrosion resistance. Sturdy and durable,