Fowler 54-530-155-0 Electronic Drop Indicator 0-1 Inch

Product Description

The FOWLER 54-530-155-0 is an electronic drop indicator designed for precision dimensional measurement in machining, toolroom, and quality-control applications. It covers a measurement range of 0 to 1 inch with a resolution of 0.000050 inches and an accuracy of 0.000160 inches, making it suitable for high-tolerance inspection work. The indicator features an LCD display for fast, clear readout and an aluminum housing for durability in shop environments. It reads in both inch and metric units. Machinists, tool-and-die technicians, and QC inspectors are the primary users of this instrument.

This drop indicator is used wherever a standard dial indicator cannot reach due to clearance constraints. Typical applications include checking runout, surface flatness, bore alignment, and part-to-fixture positioning on milling machines, surface plates, and inspection fixtures. The center lug back allows secure mounting in standard indicator holders and magnetic-base arms. It is well suited to both production floor use and bench-level inspection work in manufacturing and toolroom environments.

Key Features

• Measurement range of 0 to 1 inch (0 to 25.00 mm) with LCD digital readout
• Resolution of 0.000050 inches (0.0010 mm) for high-precision measurement
• Accuracy of 0.000160 inches (0.0040 mm)
• Dual-unit display reads in both inch and metric (mm) modes
• Center lug back mounts in standard indicator holders and magnetic-base arms
• Aluminum housing provides lightweight durability in shop environments
• Battery-powered with CR2032 cell included; no external power required

Compatibility

Designed for use with standard indicator holders, magnetic bases, and inspection fixtures that accept a 3/8-inch stem diameter drop indicator with a center lug back mounting style.

Installation Notes

Installation is performed by machinists or metrology technicians using a standard indicator holder or magnetic base arm. Secure the 3/8-inch stem firmly in the holder before zeroing the instrument to avoid measurement drift. Ensure the contact point is perpendicular to the measured surface for accurate readings. Handle the instrument carefully to avoid shock or drop damage, which can affect calibration.