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Soil Pocket Penetrometer, Chrome-Plated with Engraved Scale

Price $99.98
Minimum Purchase:
1 unit

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The Chrome-Plated with Engraved Scale Soil Pocket Penetrometer is a lightweight direct reading hand penetrometer and gives instant information for classification of cohesive soils on site or in the lab. Use is required by OSHA for trenching and excavation inspection. The unique engraved scale is machined and roll formed into the chrome metal so that the scale is permanent and can withstand heavy usage.

Spring Operated Soil Pocket Penetrometer, Chrome-Plated with Engraved Scale

The spring-operated Soil Pocket Penetrometer device has a 1/4in (6.4mm) dia. loading piston that is pushed into the soil up to a calibration groove machined on the piston 1/4in from the end. The permanent scale on the piston barrel reads approximate unconfined compressive strength in tsf2 or kg/cm2. An indicator sleeve retains reading after piston is released.

Soil Pocket Penetrometer, Chrome-Plated with Engraved Scale Specifications

The spring is calibrated and plated for rust resistance. Complete Soil Pocket Penetrometer weighs only 2oz (57g); dia. is 3/4in (19mm) and length is 6in (152mm).

Adapter Foot Attachment of 1in dia. has sixteen times the piston area, for soft soils (ordered separately).

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Soil Pocket Penetrometer

Comprehensive Overview of a Chrome-Plated Pocket Penetrometer with Engraved Scale for Soil Testing

The soil penetrometers are an indispensable tool in geotechnical engineering, utilized primarily to assess the compaction and consistency of cohesive soils directly on-site. This 2000-word overview focuses on a specific model of the pocket penetrometer, which features a chrome-plated design with an engraved scale, enhancing its durability and ease of use in various applications. This tool is critical for determining the unconfined compressive strength and shear strength of soil, which are vital parameters in assessing soil stability and bearing capacity for construction.

Design and Functionality of Chrome-Plated Pocket Penetrometer

Tool Description and Construction:
The chrome-plated pocket penetrometer is designed for durability and ease of use in harsh field conditions. The chrome plating provides a robust exterior that resists corrosion and wear. The tool's scale is precisely engraved on its surface, allowing for accurate readings of soil resistance. Typically, it includes a plunger, a set of penetration needles or cones, and a graduated scale to measure penetration resistance directly.

Needles and Cones:
The soil penetrometers typically come equipped with a needle for penetrating non-cohesive soils and a cone for cohesive soils. These accessories are crucial for adapting the tool to different types, ensuring versatile application across various testing scenarios.

Applications and Usage

Field Applications:
Primarily, the pocket penetrometer is used in field applications to quickly determine the compaction and consistency of soils. It is especially useful in remote locations where laboratory testing is not feasible. The tool is designed to be used directly on the excavation or borehole surface, providing immediate feedback on properties.

Cohesive Soils Testing with Hand Penetrometer:
For cohesive soils, soil penetrometers measure the unconfined compressive strength by applying a known force to the soil through the cone and measuring the depth of penetration. This measurement is directly related to the shear strength, which is a critical factor in determining soil stability for construction projects in need of soil penetrometers.

Bearing Capacity and Shear Strength of Hand Penetrometer:
The tool is crucial for estimating the bearing capacity of the ground in construction sites and unconfined compressive strength, helping engineers make informed decisions about foundation depth and design. It also provides quick estimates of shear strength, which are essential for assessing the potential for soil slippage and other stability concerns.

Advantages of Using the Chrome-Plated Pocket Penetrometer

Durability and Reliability of Hand Penetrometer:
The chrome plating not only enhances the tool's resistance to rust and degradation but also ensures that it can withstand the rigors of field use over time. The engraved scale remains visible and legible even after extensive use, providing reliable measurements throughout the tool’s lifespan.

Ease of Use and Portability of the Hand Penetrometer:
This hand penetrometer is designed for ease of use, with a straightforward mechanism that requires minimal training. Its compact size and lightweight design make it highly portable, fitting easily into a carrying case along with other testing accessories, making it an ideal choice for engineers and field technicians who need to conduct tests across various sites including for food products.

The hand penetrometer ability to use different needles or cones makes it suitable for a wide range of soil types, from sandy to clayey compositions. This versatility is enhanced by the tool's ability to measure different aspects of soil behavior, including compaction depth and hardness.

Practical Considerations and Limitations

Field vs. Laboratory Testing:
While the hand penetrometer provides immediate results and is excellent for preliminary assessments, it cannot replace comprehensive laboratory testing where more controlled and detailed analysis is required. The measurements obtained are often used as a preliminary guide, with further testing recommended for critical decisions regarding construction and land use.

Environmental Factors:
The accuracy of measurements can be affected by environmental factors such as moisture content and temperature. Soil that is too wet or frozen may not provide reliable readings, as the hand penetrometer is calibrated for use under normal moisture conditions and temperatures.

Maintenance and Care

To ensure the longevity and accuracy of the chrome-plated pocket penetrometer, regular maintenance is essential. This includes cleaning the metal surfaces after each use to prevent buildup, which can affect the movement of the plunger and the accuracy of measurements. Periodic calibration against standard measurements is also recommended to maintain the precision of the scale.


The chrome-plated pocket penetrometer with an engraved scale is a valuable tool for geotechnical fieldwork, offering a robust, easy-to-use, and efficient method for assessing properties on-site. While it excels in providing quick estimates of compaction and strength, it should ideally be complemented by laboratory tests for a comprehensive analysis. Its portability and versatility make it an essential instrument in the toolkit of professionals dealing with testing and related applications such as food products.

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