Windsor Probe Test System (Standard)

Windsor Probe Test System (Standard): Windsor Probe Chart

The Windsor Probe Test System (Standard) is a trusted non‑destructive concrete testing solution used to estimate the in‑place compressive strength of hardened concrete. It’s designed to comply with ASTM C803/C803M requirements, providing accurate, safe, and repeatable field testing results that are widely relied on in construction quality control and structural assessment. 

Before approving steel erection or structural form removal, ensuring that concrete has reached adequate strength is critical — and the Windsor Probe Test System delivers that insight rapidly without damaging the structure under test. 

System Components and Accessories

The Standard Windsor Probe Test System comes in a portable carrying case that includes:

• Powder‑actuated driver and actuating templates
• Manual depth gauge and printed Windsor Probe Chart to estimate compressive strength
• Moh’s Hardness of Coarse Aggregate Kit for calibration guidance

Probes themselves are not included with the system and are usually purchased separately in kit form. 

Explore more tools in the Concrete Testing Equipment category to support comprehensive field and lab testing — from slump measures to air content kits.

How the Windsor Probe Test Works

The Windsor Probe method uses a powder‑actuated driver to fire steel probes into the concrete. The system measures the penetration resistance of the probes — deeper penetration typically indicates lower strength. The average penetration from three probes is then correlated to compressive strength using validated regression models, providing reliable estimates up to 17,000 psi (110 MPa). 

This makes the system suitable for testing both fresh and mature concrete on site, including high‑performance mixes where early strength verification is required. 

Standard vs Digital Test Systems

Standard Test System

• Cost‑effective option for basic on‑site strength testing.
• Includes manual depth gauge and printed probe chart.
• Measures and records penetration in both inches and millimeters — great for routine jobsite tests. 

Digital Test System

For more advanced data collection and automation, the Electronic Measuring Upgrade for Windsor Probe can be added to transform the standard system into a digital‑ready unit with:

• Instant electronic penetration measurement
• On‑site strength estimation without manual chart lookup
• Integrated data storage and PC upload for reporting and analysis
• Improved accuracy and field efficiency
• Eliminates manual averaging and reduces operator error 

Probe Types

Windsor Probe systems use specialized probes tailored for different concrete types:

• Gold Probe Kits — Designed for lightweight concrete, delivering accurate penetration readings in low‑density mixes. Whether testing below 3,000 psi or lightweight aggregates, these probes perform reliably. 
• Silver Probe Kits — Optimized for normal‑weight concrete, suitable for a wide range of standard construction applications. Each kit typically includes three probes, three adapters, and three power loads. 

Both styles are sold individually or by case to match project testing frequency and volume. 

Benefits and Applications

The Windsor Probe Test System (Standard) is valued for:

• Fast, non‑destructive concrete strength testing
• Accurate correlation to compressive strength without requiring core samples
• Safe operation — no recoil or unexpected discharge
• ASTM C803/C803M compliance
• Suitability for on‑site construction verification, QC, and structural inspections
• Minimal setup and straightforward operation compared to lab tests 

This system is widely used by civil engineers, construction managers, QA/QC technicians, and testing labs to verify concrete strength before form removal, load application, or certification of concrete performance.

Summary

The Windsor Probe Test System (Standard) offers an efficient, non‑destructive method to estimate concrete compressive strength quickly and reliably. With modular probe kits and optional digital upgrades, it supports both routine field testing and more advanced QA workflows, ensuring construction quality and compliance with industry standards.