Read True Elevation Instantly with the Spectra Precision CTO-0319-4310 Lenker Rod
The Spectra Precision CTO-0319-4310 is a 15-foot Lenker-style direct-reading grade rod engineered to eliminate the most persistent source of elevation errors on the jobsite: mental arithmetic. Instead of reading a rod value and adding or subtracting an HI offset, crews simply set the moveable tape face to the benchmark elevation and read the actual ground elevation directly off the rod. The result is faster grade checks, fewer costly mistakes, and tighter finished surfaces—whether you're pouring a slab, cutting a swale, or establishing finish grade on a subdivision lot.
Overview & Jobsite Applications
The CTO-0319-4310 is the go-to rod for grade checkers, instrument operators, and finishing crews working with optical levels, laser levels, and digital levels. Its graduated face reads in feet, tenths, and hundredths, giving you the resolution required for precise elevation control on roads, pads, drainage structures, and utility trenches. The adjustable tape sleeve lets you dial in any benchmark elevation—positive or negative, above or below sea level—so the rod adapts to any project datum without recalculation. At 15 feet of total extension, it covers the vertical range demanded by deep-cut roadway work and high-fill embankment projects without requiring a second rod setup.
Key Specifications
- Model: CTO-0319-4310
- Brand: Spectra Precision
- Total Length: 15 feet extended
- Graduation: Feet, tenths (0.1 ft), hundredths (0.01 ft)
- Reading Style: Lenker direct-reading — displays true elevation, not rod offset
- Tape Face: Moveable/adjustable — accommodates any benchmark elevation
- Construction: Fiberglass sections for lightweight durability and electrical safety
- Compatible Instruments: Optical levels, rotating laser levels, digital levels
Key Features
- Direct Elevation Readout: Rod face displays actual benchmark elevation — crews read grade without adding or subtracting HI values
- Adjustable Tape Sleeve: Set any benchmark elevation above or below sea level in seconds; no recalculation needed when resetting from a new benchmark
- Feet / Tenths / Hundredths Graduation: Provides 0.01-ft resolution for finish-grade accuracy on slabs, roads, and drainage work
- Fiberglass Construction: Resists warping, moisture, and jobsite abuse while remaining non-conductive near overhead utilities
- 15-Foot Range: Handles deep cuts and high fills without requiring rod extensions or secondary setups
- Compact Collapsed Length: Sections nest for easy transport in a standard work truck or survey vehicle
Job Applications
Finish Grading & Subgrade Control: Grade checkers verify pad elevation in real time by reading the rod face directly — no radio back to the instrument operator for an HI reminder. Speeds up finish grading cycles on residential and commercial pads.
Roadway & Parking Lot Construction: Confirm base, binder, and surface course elevations against design grade quickly. The 0.01-ft resolution catches high and low spots before the paving crew passes over them.
Drainage & Utility Trenching: Set invert elevations and pipe slope with confidence. The direct-reading format is especially valuable when multiple crew members are checking grade independently and math errors could go undetected.
Site Layout & Benchmark Transfer: Establish and verify temporary benchmarks across a large site without converting every reading. Ideal for coordinating between survey crews and equipment operators.
Compatible Accessories
- Spectra Precision LL300N Rotating Laser Level
- Spectra Precision HR320 Laser Detector / Receiver
- Fiberglass Rod Level Bubble Vial
- Aluminum Rod Tripod & Grade Rod Holder
- Spectra Precision Carry Bag for Grade Rods
Related Guides
- How to Set Up a Lenker Rod for Any Benchmark Elevation
- Optical Level vs. Laser Level: Which Rod Do You Need?
- Grade Rod Graduation Explained: Feet, Tenths & Hundredths
- Finish Grading Best Practices for Slab & Roadway Work
Frequently Asked Questions
- What makes a Lenker rod different from a standard Philadelphia or Empire rod?
- A standard rod displays a fixed graduation from zero at the bottom, so the instrument operator must calculate the difference between the rod reading and the instrument's height of instrument (HI) to determine true elevation. A Lenker rod has a moveable tape face that you slide to match the benchmark elevation, so the rod face displays actual ground elevation directly — eliminating the subtraction step and the errors that come with it.
- Can this rod be used with a rotating laser level as well as an optical level?
- Yes. The CTO-0319-4310 works with any instrument that reads a horizontal line of sight across a graduated rod face — including optical levels, self-leveling laser levels, and digital levels. When used with a rotating laser, pair it with a compatible laser detector clipped to the rod for hands-free grade checking across large areas.
- How do I set the rod to a new benchmark elevation mid-project?
- Loosen the tape sleeve locking mechanism, slide the graduated tape until the known benchmark elevation aligns with the bottom of the rod (or your instrument's line of sight), then re-lock the sleeve. The rod now reads true elevation for that datum. The process takes under a minute and requires no tools.
- Is 15 feet enough for deep-cut highway work, or do I need a taller rod?
- For most commercial site work, finish grading, and utility work, 15 feet provides ample range. Deep highway cuts, bridge abutment work, or projects with more than 12–13 feet of vertical relief may require a taller rod or a rod extension. Contact Express Tools if you need guidance on selecting the right rod height for your application.
