Mitutoyo 547-313A Digimatic Thickness Gauge

Technical Overview

ABSOLUTE Digimatic thickness gauge featuring 0-10mm range, 0.01mm resolution, and ±20µm accuracy. Designed with interchangeable anvils for lens metrology.

Key Features

ABSOLUTE electrostatic capacitance linear encoder avoids overspeed errors and retains origin settings [1.2.5].
Optimized specifically for the center thickness verification of concavo-convex lenses and curved boards.
Hardened steel contact points and anvils are easily interchangeable to accommodate varying geometry profiles.
Highly visible 6-digit LCD display features a 330-degree rotary design for reading from any position.
Integrated GO/±NG tolerance judgment simplifies pass/fail criteria on production lines.
Supports bidirectional Digimatic S1 interface communication for direct PC-based tool programming and database logging.
IP42 protection rating ensures dust and vertical drip resistance under standard workshop conditions.

Technical Specification Matrix

Parameter	Value
Measuring Range	0 - 10 mm
Resolution (Digital Step)	0.01 mm
Accuracy	±20 µm
Parallelism	10 µm
Throat Depth	30 mm
Anvil Adjustment Range	12 mm
Measuring Force	1.5 N or less
IP Protection Rating	IP42
Encoder Type	Electrostatic capacitance type absolute linear encoder
Contact Point	ø6 mm Flat (Contact Point) / ø4 mm Spherical Ball (Standard Accessory)
Anvil	ø4.8 mm Flat
Power Supply	1 x CR2032 Battery (3V)
Battery Life	Approx. 2,700 hours of continuous use
Data Output Interface	Digimatic S1 (Bidirectional)
Display Type	6-digit LCD, 330° rotating display
Physical Weight (kg)	0.27
Dimensions L x W x H (cm)	19 x 6.5 x 5

Industrial Applications

1. Precision Optical Lens Center Thickness Validation

Used in optical manufacturing plants to verify the central focal thickness of plano-convex and concave glass elements. Quality technicians swap standard flat anvils for the supplied spherical ball contact point to calculate the exact apex or base depth without scratching the anti-reflective coatings.

Problem Solved

Standard flat micrometers cannot reach the absolute center of a curved lens surface due to physical boundary restrictions, introducing large cosine errors. This tool's interchangeable point contacts allow precise localized apex measuring.

Lens MetrologyInterchangeable PointsSpherical Contact PointOptical Inspection

2. Delicate Watchmaking and Micro-Mechanical Component Inspection

In premium mechanical watch assembly and micro-gear manufacturing, tiny curved plates and delicate brass levers must be inspected to ensure structural precision. The 547-313A's extremely low measuring force (≤ 1.5 N) allows highly repeatable measurements with an accuracy of ±20 µm without risking structural indentation.

Problem Solved

Standard mechanical dial indicators apply high spring-loaded force, which bends, deforms, or marks thin micromachined parts. The low-force spindle of this gauge prevents material stress during check-out.

Micro-MechanicsLow Measuring Force±20 µm AccuracyDeformation Control

3. Automated Quality Control in Optical Film and Battery Separator Extrusion

Used in automated web or roll production testing where continuous plastic samples are slit and measured at multiple intervals. Real-time thickness data is exported through the bidirectional Digimatic S1 interface straight into statistical process control databases (like MeasurLink).

Problem Solved

Manual transcription of sequential thickness inspections across moving films creates data errors and slows down line speed. Direct digital SPC communication automates profile-logging with perfect accuracy.

Digimatic S1 InterfaceStatistical Process ControlExtrusion QCAbsolute Encoder