Truck scales and checkweighers both measure mass, but they sit at opposite ends of the industrial weighing spectrum: a 30-100+ tonne truck scale certifies inbound/outbound truck tonnage at 0.1-0.5% accuracy for legal-for-trade invoicing, while a checkweigher inspects 0.05-50 kg packaged goods on a moving conveyor at 0.01-0.1% accuracy for production QA and regulatory compliance [S1][S3].
Specifying one in place of the other is a costly mistake: a 3 m x 18 m pit-mounted truck scale runs USD 15,000-60,000+ installed (foundation + load cells + indicator), whereas a dynamic checkweigher for a 5-30 kg food/pharma line sits in the USD 8,000-40,000 band with rejector and frame [S3]. The two also diverge on legal metrology, throughput, and data interface, so the engineering question is not "which is better" but "which class fits the duty cycle."
Definition, Scope and Typical Capacity Envelope
A truck scale (also "weighbridge" or "ground scale") is a static, axle-by-axle or whole-vehicle weighing platform designed for in-motion creep (≤ 5 km/h) or full-stop weighing of laden trucks, with capacities from 30 t (light-portable) to 200 t (heavy-mining) and platform lengths from 6 m (two-axle rigid) to 24 m+ (multi-axle articulated) [S1][S5]. A checkweigher is a dynamic, in-line weighing station, typically a short single- or multi-loadcell conveyor section, integrated with a powered belt and an automatic rejector (air blast, pusher arm, or swing arm) [S3][S4].
Capacity bands do not overlap: truck scales start where checkweighers stop. A heavy-duty checkweigher caps out around 60 kg per package in pharma and around 100 kg for bulk bag checks; above that, manufacturers move to platform-floor scales or pallet scales, not back to truck scales [S4]. The geometry differs equally: a truck scale deck is rigid steel or concrete, sized in metres, while a checkweigher's weigh zone is a 200-500 mm conveyor section tuned for stable dynamic weighing [S3].
Selection Criteria: Static Trade-Approved vs Dynamic In-Line QA
The first pass filter is throughput-and-position. If the unit is a vehicle arriving at a gate and a legal-for-trade invoice is required, the only correct instrument is a truck scale (or an axle-load scale, but never a checkweigher) [S1][S5]. If the unit is a filled bottle, bag, or carton passing 30-600 times per minute on a packaging line, the only correct instrument is a checkweigher [S3][S4].
Accuracy and resolution split further. Truck scales are governed by OIML R76 (class III/III) and regional legal-for-trade tolerances of 0.1-0.5% of reading, with displayed resolution 10-50 kg per division at 30-100 t capacity [S5]. Checkweighers targeting the same legal weight (e.g. prepacks in the EU under 76/211/EEC and MID 2014/32/EU) hit 0.05-0.1% on 1-50 kg packs, but their real engineering value is repeatability and through-package consistency, often ±0.1-0.5 g on a 500 g target [S4].
Environmental envelope also drives the call. Truck scales carry IP65-IP68 stainless or nickel-plated load cells and survive -30 °C to +70 °C ambient under pit or above-ground cabinets [S1][S2]. Checkweighers live in washdown food/pharma halls at +5 °C to +40 °C, IP65-IP69K stainless frames, with EMC and vibration profiles tuned for conveyors and VFD drives, not for vehicle dynamics [S3][S4].
Who Truck Scales and Checkweighers Are For
Truck scales are built for: aggregate quarries, scrap yards, cement plants, grain silos, port terminals, chemical plants, and any site where a vehicle's mass determines the invoice or the load-out permit [S1][S5]. They are also used as static axle-weight enforcement stations at industrial gates where the alternative is a public weighbridge too far from the production line.
Checkweighers are built for: packaged food, beverage, dairy, pharma, cosmetics, and chemical-bottle lines where a filled unit must be verified against a labelled net weight, with out-of-tolerance units automatically rejected to a bin or rework conveyor [S3][S4]. They are not a legal-for-trade sales instrument in the truck-scale sense; in many jurisdictions the checkweigher's "compliance signal" is supplementary to the filler's own fill-control loop and to the production QA system.
Anti-fit warnings. A checkweigher is not a truck scale: it cannot accept a 30 t axle, has no legal-for-trade tolerance at that mass, and its conveyor and load cells are not designed for impact loading from a tyre. A truck scale is not a checkweigher: it weighs vehicles statically, cannot follow a 200 ppm line, and will not catch a 2 g underfill on a 500 g bottle at line speed. The two are complementary, not interchangeable, and the same supplier ecosystem (A&D, Cardinal, Mettler Toledo, Bilanciai, Precia Molen, Giropes, Baykon, Sansui, plus Chinese OEMs such as Innovation Electronic and Honour) [S1][S2][S3][S4] typically carries both product lines precisely because they sit in different stations of the same supply chain.
Criteria-Based Comparison: Truck Scale vs Checkweigher
Process engineers evaluate industrial weighing equipment against four dominant criteria: capacity & throughput, accuracy & legal-for-trade status, environment & enclosure, and integration. The table below lines the two options up against those levers. [S1]
Capacity & throughput. Truck scale: 30-200 t per vehicle, 5-30 weighings/hour at a manned gate, optionally unmanned with RFID/ANPR and traffic lights [S1]. Checkweigher: 0.05-60 kg per pack, 60-600+ weighings/minute continuous, throughput set by belt speed and product length [S3][S4]. On throughput alone, the checkweigher wins by two orders of magnitude; on per-event mass, the truck scale wins by three to four.
Accuracy & legal-for-trade. Truck scale: OIML R76 class III, 0.1-0.5% of reading, divisions of 10-50 kg, used for invoicing [S5]. Checkweigher: 0.05-0.1% of reading on a stable pack, divisions of 0.1-5 g depending on capacity, often paired with OIML R51 (automatic catchweighing) or MID 2014/32/EU compliance for prepacks [S4]. Neither accuracy figure transfers to the other's duty cycle.
Environment & enclosure. Truck scale: hot-dip galvanised or painted carbon-steel deck, IP65-IP68 potted load cells, concrete or steel pit, ambient -30 °C to +70 °C, no washdown [S1][S2][S5]. Checkweigher: 304/316 stainless open frame, IP65-IP69K load cells and frame, +5 °C to +40 °C, daily high-pressure hot washdown typical [S3][S4].
Integration. Truck scale: serial RS-232/485, Ethernet, 4-20 mA, Profibus, Profinet, or EtherNet/IP to a gate management system; data fields are plate, tare, gross, time, ticket number [S1][S2]. Checkweigher: same physical layer but data fields are pack ID, weight, zone (under/accept/over), rejector action, and the unit is typically daisy-chained into an MES or line PLC rather than a gate-management suite [S3][S4]. Engineers building a dump-truck weigh-and-load system will end up combining a truck scale on the inbound side with a checkweigher downstream only if the plant also fills consumer packs; the two systems otherwise never meet on a single signal chain.
Real Use Cases and Field Configurations
A 24 m steel-deck above-ground truck scale with six 50 t compression load cells and a digital weight indicator with Ethernet/Profinet is the standard quarry/port spec; indicator options from at least 23 manufacturers are listed for this exact duty in the 2026 DirectIndustry index [S1]. A representative Chinese OEM (Honour Electrical Technology) lists ISO 9001 / ISO 14001 / ISO 20000 certified load cells and indicators for truck-scale assembly under its own brand or for OEM integration [S2].
A 5 kg pharmaceutical checkweigher with a 0.5 g division, three-zone reporting, and a pusher-arm rejector into a rework bin is the standard pharma line spec; the equipment is typically mounted on its own adjustable frame with a 0.5 m infeed/outfeed conveyor and a 5-7" colour HMI showing colourWeight-style under/accept/over cues [S4]. A representative mid-tier Chinese supplier (Innovation Electronic) groups its check weigher machine alongside column load cells, single-point load cells, shear-beam load cells, and weighing indicators/controllers as a single packaging-line kit [S3].
Combined-line pattern. In a flour mill, a truck scale at the gate weighs the inbound wheat truck (legal-for-trade, 50 t typical), the wheat is then milled, bagged in 25 kg sacks, and the sacks pass through a checkweigher (regulatory QA, 0.05 kg division) before palletising. The two systems never share a load cell or a controller, but they may share a plant MES so the inbound mass and the outbound bag count are reconciled at the silo level [S3][S4][S5]. This pattern repeats across cement, sugar, animal feed, plastic resin, and bulk-chemical plants.
Limitations, Failure Modes and Sourcing Constraints
Truck-scale failure modes are mechanical and environmental: deck corrosion at the pit edge, load-cell zero-drift after lightning, water ingress into the junction box, and foundation settlement producing a corner-load error. Routine recalibration with certified test weights (typically 20-25% of capacity, in 1-5 t blocks) is required annually in most jurisdictions, and the recalibration cost dominates life-cycle cost over the 15-25 year deck life [S1][S5].
Checkweigher failure modes are dynamic and product-dependent: underweight reading on a wet/dry surface, vibration from adjacent conveyors, belt speed fluctuation, and product geometry change (a 250 g bar vs a 250 g puck produces a different dynamic signature). The dominant field complaint is false reject rate, not accuracy drift, and the fix is mechanical isolation, dynamic tuning, and matching the weigh zone to the product length [S3][S4].
Sourcing constraints in mid-2026. Truck-scale supply is dominated by a mix of European (Bilanciai, Precia Molen, Giropes, Baykon, Cardinal), Japanese (A&D), and Chinese OEMs across more than 83 products indexed in the 2026 DirectIndustry aggregator [S1]. Chinese OEM load cells and indicators (Honour Electrical, Innovation Electronic, Sansui, Puls) are competitive on lead time and price but vary on metrology approval coverage; European and Japanese names dominate the OIML R76/NTEP legal-for-trade ticket [S2][S3]. For checkweighers, Mettler Toledo, Minebea Intec, Ishida, and Loma Systems hold the high-end food/pharma bracket, while Chinese OEMs cover the cost-sensitive food and industrial-bulk bracket with similar belt-and-rejector architectures [S3][S4]. Engineers specifying a 2026 build should verify the load cell carries the OIML/test certificate for the actual legal-for-trade division class required, not just a generic CE/RoHS dossier, and should confirm the indicator's protocol (EtherNet/IP, Profinet, Modbus TCP) is the plant's native bus, since fieldbus mismatches account for a large share of integration delays on both truck-scale and checkweigher installs [S1][S2].
Verifiable next nodes: (a) the 2026-06-23 OEM product catalogue snapshot showing check weigher machines, load cells, and indicators in a single packaging-line kit [S3]; (b) the 2026-06-06 manufacturer index of 23 weighbridge-indicator suppliers with 83 active products [S1]; (c) the 2022-06-08 reference description of the truck scale as the standard bulk-goods weighing instrument in factories and trading sites, still applicable as the textbook definition in mid-2026 [S5]. Engineers sourcing a 2026 build can track those three artefacts as the working baseline for cross-checking vendor claims on capacity, accuracy, and metrology class.
For related coverage, see Stepper Drive 2026 Buying Guide: Bus, Current, Microstep and Feedback.