These zero plates allow accurate zero adjustment of magnetic, eddy-current, or ultrasonic coating thickness gages. Available in multiple sizes and materials, they serve as reference surfaces for verifying instrument zero and as supports for shim or block measurements in field or laboratory settings.

DeFelsko Zero Plates for Coating Thickness Gages

Designed as calibration accessories, DeFelsko Zero Plates provide a stable, known reference surface for gage zeroing. Often included in standard sets, they also act as substrates for measuring shims or coatings on nonmetal materials. Their precision machining ensures minimal deviation in thickness reference.

Features

Precision machined surface

Flat, uncoated steel (1018) or aluminum (6061-T6) to provide reliable reference zero

Multiple sizes & materials

Options: small round, medium square, large square in steel or aluminum

Traceable calibration

Plate values traceable to national metrology institute, used in standard sets

Zero baseline & shim base use

Used to verify and set gage zero, or as base for measuring shims or soft materials

Durable & protective format

Supplied in protective binders or mounts to prevent surface damage

Overview

Specification	Value / Description
Materials	Uncoated precision steel (1018) or aluminum (6061-T6)
Plate sizes & models	Small round Ø 38 mm (1.5″) Medium square 100 × 100 × 6 mm Large square 180 × 180 × 6 mm
Ideal for probes / use cases	Small steel plate: PosiTector 6000 F, FS, FRS, FN, etc. Medium plate: FT, FTS, etc. probes. Large plate: FLS, J probes, etc.
Function / role	Provide zero point for gages, base for shims or measuring materials lacking substrate
Additional info	Plates are part of coated metal standard sets and verification protocols