David White SitePRO 27-RD100 Basic Laser Detector Receiver

Reliable Red Beam Detection for Everyday Contractor Work

The David White SitePRO 27-RD100 is a purpose-built rotary laser detector designed for contractors who need dependable grade and level confirmation on standard construction sites. Compatible with red beam rotary lasers, the RD100 delivers clear audible and visual signals to help crews quickly find and hold grade without second-guessing the reading. Whether you are setting forms, checking sub-base elevation, or coordinating interior leveling, the RD100 gives your rod person a straightforward tool that works job after job.

Overview and Jobsite Applications

The SitePRO RD100 slots in as the entry-level detector in David White's SitePRO receiver lineup, making it an efficient choice for contractors who run red beam rotary lasers and want a compact, clip-on receiver that does not slow the crew down. The 1.75-inch capture window intercepts the rotating beam reliably at typical working distances found on residential and light commercial sites. The detector mounts to grade rods and laser staffs via a standard clamp, and the intuitive indicator display lets any crew member read elevation status at a glance without additional training.

Key Specifications

• Compatible Beam Type: Red beam rotary lasers
• Detection Window Height: 1.75 inches
• Signal Output: Audible beeper and LED visual indicator
• Grade Indication: On-grade, above-grade, and below-grade signals
• Mounting: Standard rod clamp included
• Housing: Impact-resistant ABS construction
• Power: Standard 9V battery
• Manufacturer: David White Instruments
• Model Number: 27-RD100

Key Features

• Clear LED display with above, on, and below grade indicators for fast visual confirmation
• Audible tone changes signal proximity to on-grade, reducing reliance on visual checks at distance
• Compact profile fits easily in a tool pouch and does not add awkward bulk to the grade rod
• Durable ABS housing resists impacts and daily jobsite handling
• Standard rod clamp secures to most grade rods and laser staffs without additional hardware
• Simple single-button operation minimizes setup time and crew training requirements
• Compatible with the full range of David White SitePRO red beam rotary lasers

Job Applications

Site Grading and Earthwork: Mount the RD100 on a grade rod and run it with your rotary laser to confirm cut and fill depths across a pad or lot. The audible tone keeps the rod person informed even when their eyes are on the ground, speeding up the grading pass.

Concrete Flatwork and Form Setting: Use the RD100 to set form heights and confirm slab elevations before the pour. The on-grade LED gives the form setter immediate feedback, reducing the back-and-forth communication between the instrument operator and the crew at the forms.

Foundation and Footing Layout: Carry the RD100 along the excavation perimeter to check bottom-of-footing elevations and confirm consistent bearing depth, keeping footings level without repeated instrument checks.

Interior Leveling and Dropped Ceilings: On interior commercial projects, the compact size of the RD100 makes it easy to use in tighter spaces when setting ceiling grid elevations or checking floor flatness with a red beam interior rotary laser.

Compatible Accessories

• David White SitePRO Rotary Lasers — Red beam rotary lasers that pair directly with the RD100 detector
• Grade Rod Extensions — Extend your rod reach for deeper cut readings on earthwork projects
• Laser Rod Clamps — Replacement and upgrade clamps for securing the RD100 to various rod diameters
• Laser Detector Carrying Cases — Protective storage pouches for transport between sites

Related Guides

• How to Use a Rotary Laser Detector on a Grade Rod
• Red Beam vs. Green Beam Rotary Lasers: Choosing the Right Tool
• Setting Concrete Forms with a Rotary Laser and Detector
• David White SitePRO Laser System Buyer's Guide

Frequently Asked Questions

Is the RD100 compatible with green beam rotary lasers?

No. The David White SitePRO 27-RD100 is designed specifically for red beam rotary lasers. It will not reliably detect green beam lasers. If you are running a green beam rotary laser, you will need a detector specified for green beam wavelengths.

What is the maximum working range of the RD100?

Working range depends on ambient light conditions and the output power of the rotary laser in use. Under typical outdoor conditions with a compatible David White red beam rotary laser, the RD100 performs reliably at the working distances common on residential and light commercial sites. For extended range requirements, consult the specifications of your specific rotary laser model.

Does the RD100 come with a rod clamp?

Yes. The SitePRO 27-RD100 includes a standard rod clamp for mounting to grade rods and laser staffs. The clamp accommodates standard rod diameters used on most contractor grade rods.

What battery does the RD100 use?

The RD100 operates on a standard 9V battery, which is widely available at hardware stores and supply houses. Battery life will vary based on frequency of use and the volume setting of the audible indicator.