Main risks

• Finger pinches when opening or closing the jaws and when sliding the slider.
• Minor cuts from sharp jaw edges or from the feeler gauge leaves.
• Measurement errors due to dirt, burrs, hot parts or excessive pressure, which can lead to faulty assemblies.
• Scratching or damaging delicate surfaces if more force than necessary is applied.
• Flying swarf or splinters when measuring freshly machined parts, posing a risk to the eyes.
• On digital models, risks associated with button cells: ingestion by children, leakage, or overheating due to short-circuit.

Safe use

• Before use, check that the calliper is clean, free of play and that the jaws close parallel; set zero as instructed by the manufacturer.
• Clean the workpiece and remove burrs; do not measure moving parts and allow them to cool if hot.
• Apply light, steady pressure when closing; use the locking screw only to hold the reading, without forcing.
• Hold the calliper by the frame and keep fingers clear of the jaws' travel to avoid pinches.
• For depth measurements, seat the base flat and advance without tilting or forcing the rod.
• Wear eye protection when working near swarf, sharp edges or rough surfaces.
• Protect the instrument from knocks, excessive dust and splashes; on digital models, avoid immersion in liquids.
• When changing the battery, use the specified type, observe polarity and keep loose batteries out of the reach of children.

Storage and maintenance

• After each use, wipe with a soft cloth to remove dust, swarf and moisture; on steel models, apply a light film of fine oil to prevent corrosion.
• Store the calliper in its case, with the jaws slightly open, protected from knocks and drops.
• Avoid extreme temperatures, direct sunlight and sudden changes that may affect accuracy.
• Periodically check accuracy with a simple standard; if you detect unstable readings or excessive play, stop using it until it has been inspected.
• Do not use harsh solvents or blow compressed air directly onto the dial or display.
• Replace the battery when necessary and remove it if it will not be used for prolonged periods.

Restrictions on use

• Not a toy: keep out of the reach of children and pets; use under adult supervision in educational activities.
• Do not use as a lever, press, compass, screwdriver or as a cutting or marking tool.
• Do not measure rotating parts or bring the calliper near entrapment hazards.
• Do not force the adjustment to “make the jaws fit”; if it does not fit, use another tool or an appropriate measuring method.
• Do not use the instrument if it is bent, with misaligned jaws, damaged feeler gauge leaves or a cracked display/dial.
• Do not modify or disassemble components of the calliper; this may compromise safety and accuracy.