Unattended Truck Scale Systems in 2026: Are Kiosks, RFID and Cameras Worth It for California Sites?

An unattended truck scale system sounds simple: take the person out of the scale house and let the trucks weigh themselves. In practice, it’s a mix of hardware, software, site layout and legal rules, and getting any one of them wrong costs you more than the operator you were trying to save.

The manufacturers’ brochures make automation sound right for everyone. It isn’t. A quarry running 300 repeat trucks a day is a very different case from a recycling yard that weighs walk-in public customers. And in California, the type of material you sell decides whether an unattended system can issue a legal weighmaster certificate at all.

We’ve spent more than 50 years installing and servicing truck scales across California and Arizona. This guide covers how unattended systems work, what each part does, what California law allows, and a simple way to work out whether it pays off at your site.

How an Unattended Truck Scale Works

Every system follows the same basic flow, whatever the brand.

1. Arrive and identify. The truck pulls onto the scale. A traffic light holds it until the system knows who it is: an RFID tag on the truck, a badge, a QR code, a PIN at the kiosk, or a license plate read by a camera.
2. Position check. Sensors or loop detectors confirm the whole truck is on the deck and not hanging off an end.
3. Weigh in. The indicator captures a stable weight. A remote display shows the driver the number.
4. Load or unload. The truck goes to the pit, pile or dock.
5. Weigh out. The truck returns. The system matches it to its inbound record, or uses a stored tare, and calculates net weight.
6. Ticket. The kiosk prints a ticket or the system emails it, and the light turns green.

All of this is logged automatically, with a time stamp, the truck ID and, in many systems, a photo.

The Building Blocks

Component	What it does	Notes for buyers
Certified truck scale and indicator	Produces the legal weight	Must be NTEP-approved, sealed and in tolerance; automation can’t fix a bad scale
Driver kiosk	Touchscreen, scanner, keypad, ticket printer	Mount at cab height; outdoor-rated for heat and dust
Truck ID (RFID, QR, PIN, plate camera)	Tells the system who is on the scale	See the comparison below
Traffic lights	Tell the driver when to pull on and off	Simple, but stops most errors
Position sensors / loop detectors	Confirm the truck is fully on the deck	Prevents short-weighing
Remote display	Shows the driver the live weight	Builds trust with drivers
Cameras / CCTV	Photo record of each transaction	Helps resolve disputes and deter fraud
Ticketing software	Stores customers, products, tares and tickets	Integrates with accounting / ERP
Intercom or help button	Reaches staff when something goes wrong	Essential for after-hours use

Driver Kiosks and Mobile Apps

The kiosk is the face of the system. It’s where drivers scan a card, enter a job number or pick a product, and where the ticket comes out. Mettler Toledo, Rice Lake and Cardinal all make kiosk terminals, and some systems now let drivers use a mobile app from the cab and receive an emailed ticket instead of a printed one (Mettler Toledo).

RFID vs QR Codes vs License-Plate Cameras

ID method	How it works	Best for	Watch out for
Short-range RFID badge	Driver holds a card to the reader (about 3–5 in)	Repeat drivers, low budgets	Driver must reach the reader
Long-range RFID tag	Tag on the truck read from up to about 15 ft	High-volume repeat fleets	Costs more; each truck needs a tag
QR code / barcode	Driver scans a printed pass or phone screen	Mixed traffic, temporary customers	Passes get lost or shared
PIN at kiosk	Driver types an account number	Low-tech backup for any site	Slower; typing errors
License-plate camera (LPR)	Camera reads the plate	Public customers, no tags needed	Dirty or missing plates; lighting

RFID read ranges from Cardinal Scale. Cardinal notes RFID is most valuable for closed-loop, repeat fleets and less useful for one-off public weighments.

Traffic Lights, Positioning and Cameras

These are the cheapest parts of the system and the ones that prevent the most problems. A red light that won’t turn green until the truck is fully on the deck stops short-weighing. A photo with every ticket ends most “that wasn’t my truck” disputes.

Ticketing Software and ERP Links

Software is where the savings really show up. Every transaction goes straight into your customer records, so nobody re-keys tickets at the end of the day. Ask any vendor how the software connects to your accounting system, and who supports it when it breaks.

Legal-for-Trade and Weighmaster Rules in California

This is the section the brochures leave out, and it should come first in your planning.

In California, anyone who weighs a commodity and issues a weight statement used to buy, sell or charge for it is a weighmaster and needs a license (B&P Code §§12700 and 12703). When payment depends on the weight, the weighmaster must issue a weighmaster certificate (§12711), and the certificate must carry the signature of the weighmaster who determined the weight (§12715(c)). An electronically imprinted name can replace a handwritten signature (CDFA weighmaster law extract).

What §12737 Allows

Since January 1, 2020, B&P Code §12737 has let a weighmaster use an unattended weighing system for vehicles carrying construction materials, including earth, stone, rock, sand, gravel, limestone, ready-mixed concrete, cementitious and recycled construction materials, and asphalt paving materials (§12737). The key conditions:

• Certificates go to buyers who opt to use the unattended system.
• The system must follow the CDFA Secretary’s regulations or policies.
• The principal weighmaster’s name and the system’s unique ID number must be imprinted on each certificate.
• Existing weighing and ticketing systems aren’t affected.

Your situation in California	Fully unattended certificates?	What to plan for
Quarry, sand and gravel, ready-mix, asphalt plant	Yes, under §12737	Weighmaster license, system ID on certificates, CDFA policies
Recycled construction materials	Yes, under §12737	Same as above
Scrap metal, recycling, landfill tipping fees	Not covered by §12737	A licensed weighmaster or deputy responsible for each certificate; automate data capture around them
Agriculture, feed and grain sales	Not covered by §12737	Same; confirm with CDFA DMS or your county sealer
Weighing your own trucks (no sale based on weight)	No certificate needed	Automation is purely an efficiency decision

This table is a planning guide, not legal advice. Always check with the CDFA Division of Measurement Standards or your county sealer before you buy.

The Scale Itself Still Has to Be Legal

Automation doesn’t change the scale rules. The weighing device must be approved, tested and sealed (§12717), and the indicator and any device that prints a weight must be NTEP-approved for legal-for-trade use. Other states treat unattended scales with extra care too. Idaho’s weights and measures office, for example, has required unattended scales to hold a continuous zero, let the driver get a ticket before leaving, and print “WEIGHT DETERMINED ON AN UNATTENDED SCALE” on each ticket (Idaho W&M).

Is It Worth It? A Decision Framework

Three questions decide most cases.

Trucks per Day and Operating Hours

Automation saves the most where a person currently sits in the scale house for long hours keying in tickets. Sites open early, late or on weekends, or running more than one shift, see the biggest gains. A site weighing a handful of trucks during office hours often doesn’t need it.

Repeat Fleets vs One-Off Customers

Repeat customers with tagged trucks and stored tares get the fastest transactions. Sites serving the public need QR codes, PINs or plate cameras, plus a help button, because every new driver is a first-timer.

A Simple Payback Worksheet

Use your own numbers. The example column is there to show the math, not to quote a price.

Input	Your site	Example inputs (illustrative)
Scale-house hours freed per day		10
Loaded labor cost per hour		$35
Operating days per year		300
Annual labor freed (hours × rate × days)		$105,000
Other yearly savings (overtime, paper, errors, disputes)		Add your own
Total system cost (hardware, software, install, training)	Your quote	Your quote
Payback in years (cost ÷ annual savings)		Quote ÷ $105,000

Most sites don’t remove a person entirely; they move scale-house staff to sales, dispatch or yard work. Count only the hours you’ll actually stop paying for, or reassign to work that earns money.

Retrofit Your Existing Scale or Buy New?

Most automation projects start with the scale you already have. A retrofit adds the kiosk, ID readers, lights, sensors and software around your existing deck and indicator. It makes sense when:

• The scale passes calibration and has no structural problems.
• The indicator is NTEP-approved and can talk to modern software.
• The site has room for a kiosk at cab height on both sides, if trucks weigh in and out.

Buy new, or replace the deck first, if the scale is near the end of its life, keeps failing calibration, or is too short for your trucks. Automating an unreliable scale just means it fails with nobody watching. Our truck scale installation team can assess both options on site.

Industry Use Cases

Quarries, Sand and Gravel, Ready-Mix and Asphalt

This is where unattended weighing fits best in California. The material is covered by §12737, the same contractors’ trucks come back all day, and early starts are normal. Long-range RFID tags plus stored tares let repeat trucks weigh without the driver leaving the cab.

Landfills and Transfer Stations

High volumes and long hours make automation attractive, but tipping fees are charged on weight, and §12737 doesn’t cover refuse. Most sites automate truck ID, lights, cameras and tickets for their commercial haulers while keeping a licensed weighmaster responsible for certificates. See our waste management scales.

Scrap and Recycling Yards

Public sellers, cash payments and fraud risk make photos and a firm audit trail essential. Plate cameras and CCTV with each ticket help, but staff usually stay involved. See scrap and recycling scales.

Agriculture, Feed and Grain

Harvest brings huge peaks of repeat trucks over a few weeks. Kiosks and RFID can shorten lines at packing houses and grain receivers, with a weighmaster responsible for certificates. See agricultural farm scales.

Real-World Example: KapStone Paper Mill

KapStone Paper and Packaging’s mill in Roanoke Rapids, North Carolina, runs 24/7 and receives wood chips and round wood from many vendors across two truck scales. It used to need an attendant for every truck. Cross Engineered Solutions added loop detectors, stoplights, remote displays, two self-service kiosks with scanners and two printer kiosks, integrated with the existing Rice Lake indicators and ticketing software (case study).

The results reported:

• About 500 overtime hours saved per year (estimate)
• A chip truck completes weigh-in, dumping and weigh-out in about 15 minutes
• 24/7 delivery hours for suppliers
• An automatic, impartial record of every transaction, which reduces fraud risk

One detail worth copying: inbound round-wood trucks still see an attendant for quality checks. Good projects automate the routine work and keep people where judgment is needed.

Keeping an Unattended Scale Accurate and Online

With nobody in the scale house, problems can run for hours before anyone notices. Build these into the plan from day one:

• Calibration on a fixed schedule. Book commercial truck scale calibration with certified test weights, and after any repair or major change in traffic.
• Preventive maintenance. Clean under the deck, check load cells, cables and junction boxes, and test the kiosk, readers and lights. See our preventive maintenance plans.
• Surge and lightning protection. Kiosks and readers add more electronics to protect.
• Heat and dust. Central Valley summers and Arizona sun are hard on screens and printers; choose outdoor-rated hardware with shade.
• Alerts. Set the software to flag a zero that won’t settle, a reader that stops reading, or a printer that’s out of paper.
• A plan for downtime. Know who to call for emergency truck scale repair, and how to run tickets manually until it’s fixed.

If your fleet is adding electric trucks, store their own tares too; we explain why in our guide to electric truck weight limits.

Before You Buy: A Readiness Checklist

• ✅ Confirm whether your material is covered by B&P Code §12737
• ✅ Check your weighmaster license and deputies are current
• ✅ Make sure the scale passes calibration and the indicator is NTEP-approved
• ✅ Count trucks per day, repeat vs one-off, and hours open
• ✅ Pick an ID method: RFID, QR, PIN or plate camera
• ✅ Plan kiosk positions, lights, sensors, power and network
• ✅ Decide how tickets and data reach your accounting system
• ✅ Set up calibration, maintenance and a downtime plan

Frequently Asked Questions

Sources

1. California B&P Code §12737, Unattended weighing systems
2. CDFA Division of Measurement Standards, Weighmaster law extract, §§12700–12737
3. Cross Engineered Solutions, KapStone Paper Mill case study
4. Cardinal Scale, Contactless truck scale ticketing with RFID
5. Mettler Toledo, Automate your truck scale
6. Idaho Weights and Measures, Criteria for unattended vehicle scales