Length Comparator with Digital Dial Indicator

Digital Dial Indicator Length Comparator

Length Comparator for measuring length changes in 10in (254mm) cement, mortar and concrete specimens. Will accommodate test specimens of various types including hardened cement paste, mortar and concrete. Includes Invar Reference Bar for zeroing dial or digital indicator. Digital length comparator for measuring length changes in hardened cement paste, mortar and concrete specimens. Stationary and moving anvils designed to fit Gauge Studs cast into test specimens. Mounted on a sturdy vertical support stand attached to a triangular base with adjustable terminal and collar.

Measures length changes in both inches and millimeters. Digital indicator has .0001 inch resolution.

Test specimens up to 4x4x10in (102x102x254mm) cross-section but 1x1x10in (25x25x254mm) prisms are standard.

The Digital Indicator is powered by 2 standard replaceable lithium batteries or AC adapter, both included. LCD digital display has auto On/Off and can switch between inch and mm. Internal memory stores user settings. Range is 0.6in (15mm).

Gage Studs for Mortar Bars are required for use with cement prism molds.

Features:

• Digital or Dial Indicator

• Measures changes in 10in mortar bar specimens

• Meets ASTM and AASHTO specs

• Upright support and base

• Additional equipment: Strike Off Bar for Concrete Air Meters, Aluminum, 1 x 13-1/2in

Includes:

• Length Comparator with Digital or Dial Indicator

• Invar Reference Bar

• Stationary and Movable Anvils

• Support Stand and Base

• 2 lithium batteries

• Adapter cord (Indicator model)

• 11 x 11.5 x 17in (279 x 292 x 432mm), WxDxH

Meets Test Methods:

ASTM C227 , ASTM C1260 , ASTM C1012/1012M , ASTM C151/151M , ASTM C157/157M , ASTM C490/490M , AASHTO R 70M/R 70 , AASHTO T 107M/T 107. For more information on ASTM-compliant equipment like thermometers, visit Certified Material Testing Products.

Length Comparator

A Length Comparator is a precision instrument used to measure changes of hardened cement, mortar and concrete specimens. Users can switch measurement units from inches to millimeters by pressing a button. It’s a must have in the construction and materials testing industry, allowing users to measure dimensional changes of various materials under different conditions. By pressing a button, users can switch units effortlessly. The Length Comparator meets industry standards, ASTM and AASHTO specs, for accurate and reliable measurements. Measurement units can be switched between inches and millimeters for user convenience and precision. Digital can be zeroed at any point on its measurement range for flexibility in measurements of different sample lengths. For professionals working with concrete prismatic specimens, hardened cement mortar and other mortar and concrete materials, this is a critical tool to get changes and stability data.

Key Components and Features

The Length Comparator has several key components that work together to measure. These are:

• Stationary and Movable Anvils: Fit Gauge Studs cast into test specimens, these anvils ensure secure and accurate positioning. Stationary and movable anvils are designed to enhance precision and adaptability.

• Movable Anvils Designed: These anvils are integral components that accommodate gauge studs cast into test specimens, ensuring precise measurements and compliance with various industry standards.

• Upright Support: Sturdy upright support attached to a solid triangular base, this support is stable and consistent.

• Nut Collar: Part of the elevating screw and anvil assembly, the nut collar is important for the assembly’s functionality and repair.

• Screw: The assembly includes screw components for proper functioning and adjustments.* Stationary Anvils: Accommodates different gage studs for precise length change measurement in concrete and cement paste specimens.

• Invar Reference Bar: For zeroing dial or digital indicator.

• Digital Indicator or Dial Indicator: Measure length, auto On/Off and unit conversion.

• Anvil Assembly: Can accommodate test specimens up to 4” x 4” (102 x 102mm) cross-section, versatile for various testing needs.

• Additional Calibration Anvils: For maintaining the accuracy of Concrete Test Hammer, ASTM C805, the use of a Calibration Test Anvil for Rebound Hammer is crucial after every 1,000 to 2,000 impacts.

A Length Comparator measures changes of hardened cement, mortar and concrete prismatic specimens, so a must have for testing and quality control in the construction industry.

Measurement Procedure

The measurement process with a Length Comparator involves:

1. Prepare Test Specimen: Cast gauge studs into the ends of the specimen so it’s ready to measure.

2. Set up Length Comparator: Attach test specimen to stationary and movable anvils, which are designed to receive the reference pins cast into the ends of the test specimen bars so it fits securely.

3. Zero Indicator: Zero the digital or dial indicator with the Invar reference bar so it can be zeroed at any point on the range so you have a baseline for measurement.

4. Measure Changes: The Length Comparator measures the changes of the test specimen so you get accurate readings.

5. Record Data: Record and analyze the measurement data to get dimensional changes of the test specimen so you get material performance data.

Applications and Advantages

The Length Comparator is used in the construction industry for:

• Testing and Quality Control: To check the quality and stability of cement paste, mortar and concrete prismatic specimens.

• Effective Length Samples: Measures changes in hardened cement, mortar, and concrete specimens, specifically designed for effective length samples of 10" and 16".

• Measure Changes: Measures changes of hardened cement paste, mortar and concrete specimens under different conditions.

• Gradations: Has fine gradations of .0001 inches for detailed and accurate results.

• Dimensional Evaluation: To evaluate dimensional changes of various materials so they meet industry standards.

• Compliance with Standards: To ensure materials meet ASTM and AASHTO specs so you can have confidence in their performance.

You get:

• Accurate and Precise Measurements: Indicators mounted on a solid support provide precise measurements for quality control and testing.

• More Efficient and Productive: Simplifies the measurement process, saves time and labor.

• Better Quality Control: Monitor and maintain material quality.

• Compliant with Industry Standards: Meets ASTM and AASHTO specs so materials are up to standard.

• Versatile Measurement Options: Works with indicators in English and Metric units, measures changes.

Advantages and Features

High Accuracy and Precision: Measures length.

• Indicator: Digital has extra features.

• Accessories: Includes additional items and replacement parts for specific models.

• Solid Upright Support: Attached to a triangular base so it’s stable.

• Add to Cart: Users can add products to a saved cart for future purchases, requires an account to manage.

• Cart Feature: Saved cart allows users to manage and access items upon signing in.

• Dial: Dial gauge has specific dimensions and graduations.

• Related Item: Customers who purchased this item also purchased related accessories and models.

• Variety of Items: Many items to choose from, including Digital Field Scale, 110lb, different models and accessories to meet your needs.

• Manage Products: Users can manage products in their cart, add items with specified quantities and access by signing in.

• Unit Accommodates Test Specimens: Measures changes in hardened cement, mortar, and concrete specimens up to 4” x 4” (102 x 102mm), ASTM and AASHTO compliant.