Designed for PosiTector UTG probes, the Certified Step Blocks series includes multiple sets of stepped reference blocks (imperial and metric). Each block is factory calibrated to tight tolerances and includes a certificate of calibration, providing reliable standards for periodic verification and compliance.

DeFelsko Certified Step Blocks

DeFelsko’s Certified Step Blocks are robust, nickel-plated 1018 steel reference standards used to verify ultrasonic thickness gauge performance. With calibrated step increments and documented traceability, they support ongoing calibration checks and quality assurance protocols in inspection workflows.

DeFelsko Certified Step Blocks

Features

01
Traceable calibration certificate

Each set includes a long-form calibration certificate with material test report

02
Machined 1018 steel, nickel-plated

Durable construction with corrosion and wear resistance

03
Imperial and metric sets available

Supports both mil/inch and mm versions for diverse use cases

04
Tight accuracy tolerances

Imperial ±1 mil; Metric ±0.025 mm (or other tolerances depending on block)

05
Compatible with PosiTector UTG probes

Designed specifically for verifying UTG (ultrasonic thickness) probes

Overview

DeFelsko Certified Step Blocks
SpecificationValue / Description
Material / constructionSteel 1018, nickel-plated for corrosion & wear resistance 
Available sets / modelsB1 (Imperial), B1M (Metric), B2 (High-Range Imperial), B2M (High-Range Metric), P (Thin Imperial) 
Step sizes (imperial sets)B1: 100, 200, 300, 400, 500 mil ; B2: 1.000”, 1.500”, 2.000”, 2.500”, 3.000”, 3.500”, 4.000”, 4.500” 
Step sizes (metric sets)B1M: 2.5, 5, 7.5, 10, 12.5 mm ; B2M: 25.0, 37.5, 50.0, 62.5, 75.0, 87.5, 100, 112.5 mm 
Accuracy / toleranceImperial sets: ±1 mil; Metric sets: ±0.025 mm (or equivalent) 
Supplied paperworkLong-form Certificate of Calibration + Material Test Report 
Use / applicationChecking calibration / verification of ultrasonic thickness gauges (e.g. PosiTector UTG)