Caliper EPM 150 mm measuring tool, 0.05 mm resolution (E-400-5001)

EPM 150 mm caliper with 0.05 mm resolution (model E-400-5001) is a compact handheld measuring tool designed for precise external, internal and depth measurements up to 150 mm. The caliper uses a vernier-style scale that allows readings to 0.05 mm, and its metal jaws and rigid beam provide stable contact with workpieces. Its size and construction make it suitable for workshop, hobbyist and inspection tasks where a small, accurate instrument is needed.

Advantages

The caliper offers fine resolution of 0.05 mm for more detailed measurements than standard 0.1 mm vernier calipers, while remaining entirely mechanical and not requiring batteries. Metal jaws and a solid beam deliver durable measurement surfaces resistant to wear under normal workshop use. The 150 mm measuring range keeps the tool compact and easy to handle or store, and the vernier scale provides repeatable readings for external, internal and depth measurements.

Suitable for

• Precision external diameter and length checks on small components
• Internal measurements of bores and grooves within the 150 mm range
• Depth measurement of slots, steps and holes
• Workshop, hobby and inspection tasks requiring a compact measuring instrument

Key specifications

• Measuring range: up to 150 mm
• Resolution: 0.05 mm (vernier scale)
• Measurement functions: external, internal and depth
• Construction: metal jaws with rigid beam
• Handheld, mechanical operation (no batteries required)

How to use

Place the caliper jaws around or inside the feature to be measured and slide the movable jaw until it contacts the workpiece without forcing. For depth measurements, extend the depth rod into the hole or slot and ensure the caliper beam rests flat against the reference surface. Read the vernier scale by aligning the main scale mark with the vernier division that best matches; interpret the reading to the nearest 0.05 mm following the vernier reading method. Use steady, consistent pressure and ensure surfaces are clean for accurate results.

Usage recommendations

Keep measuring surfaces clean and free of debris, avoid excessive force when closing the jaws, and store the caliper in a protective case or pouch to prevent knocks and corrosion. Periodically check accuracy against a gauge block or reference standard and replace the tool if wear affects repeatability.