Checkweighers & Weight Inspection Machines
A checkweigher (check weigher) is an automatic machine that weighs every product in motion on a conveyor, compares each weight against preset limits, and rejects out-of-tolerance packs without stopping the line. MIQI builds 44 checkweigher and inspection models covering 1 g to 80 kg, with dynamic accuracy from ±0.02 g — factory-direct from Guangdong, China.
This page compares dynamic checkweighers, weigh-print-apply systems, in-motion parcel scales, metal detectors, X-ray inspection, weight sorters, packing machines and custom builds—with real model specifications, quote factors and a selection guide.
Three performance tiers, one factory
- ▸Accuracy from ±0.02 g
- ▸Range 0.1 – 1000 g
- ▸Multi-lane up to 6 lanes
- ▸Hygienic 304 stainless design
Tablets, capsules, sachets, stick packs, small cosmetics, electronic components
- ▸Accuracy ±0.3 – 3 g
- ▸Range 1 g – 5 kg
- ▸Belt speed up to 90 m/min
- ▸Metal-detector combo available
Snacks, frozen food, bakery, meat trays, sauces, pet food, daily chemicals
- ▸Range up to 80 kg
- ▸Belt speed up to 120 m/min
- ▸Roller or belt conveyor
- ▸Barcode, print, label and DWS integration options
Shipping cartons, appliance boxes, rice/feed bags, parcel sortation, e-commerce
All 9 series at a glance
| Series | Models | Weighing range | Dynamic accuracy | Max speed | Best for |
|---|---|---|---|---|---|
| Automatic checkweighers | 11 | 0.1 g – 80 kg | ±0.02 – 30 g | 90 m/min | 100% inline weight inspection on any packaging line |
| Weigh-print-apply labeling systems | 5 | 1 g – 50 kg | ±0.5 – 2 g | 15 – 50 pcs/min | Weigh, print and apply labels in one pass (top / side / bottom) |
| In-motion parcel weighing systems | 3 | 1 g – 60 kg | ±1 – 50 g | 120 m/min | Parcel weight verification, barcode, print, label and sort integration |
| Metal detectors & combos | 4 | combo: 1 – 2000 g | Fe from 0.1 mm | 28 m/min | Ferrous / non-ferrous / stainless contaminant detection, foil packs |
| X-ray inspection machines | 2 | products under 10 kg | SUS 0.4 mm · glass 1.0 mm | 60 m/min | Metal, glass, stone, ceramic and dense-plastic foreign objects |
| Forward/reverse sorting scales | 2 | 1 – 1000 g | ±0.02 – 1 g | 70 packs/min | Accept/reject sorting for traditional & specialty foods |
| Weight sorters / graders | 4 | 1 g – 2 kg | ±0.3 – 2 g | 300 m/min (disc) | Grading seafood, poultry, crayfish, fruit into weight bands |
| Weighing & counting packers | 1 | 200 g – 5 kg/bag | 0.5 – 10 g | 4 – 6 bags/min | Hardware, granules and mixed parts bagging |
| Custom machines | 12 | built to spec | built to spec | built to spec | Bottle-clamping, explosion-proof, vision+weight, air-cargo, dual-channel |
Figures are series-level ranges; every machine is configured to your product before shipping. Click a series for model-level specifications.
What Determines Checkweigher Price?
A defensible checkweigher price comparison starts with the same product, speed, tolerance, platform, reject and data scope. Published headline figures without those conditions are not equivalent quotations.
| Compact dynamic checkweigher | Project quote | Product, tolerance, speed, platform and reject method |
| Industrial food / packaging line | Project quote | Hygiene, line integration, data and reject confirmation |
| Multi-lane / high-precision system | Project quote | Lane count, filler pitch, product handling and validation |
| Food X-ray inspection | Project quote | Tunnel, product test, contaminant target, shielding and service scope |
Send target weight, tolerance, packs per minute, pack dimensions, photographs and the required reject or interface. MIQI can then identify a documented model and arrange representative sample testing before the final specification.
How to choose a checkweigher: 5 steps
- 1Define weight range and the accuracy you need at line speed
Accuracy specs only mean something at your real throughput. A ±0.1 g machine at 30 packs/min may be ±1 g at 90 packs/min. State target weight, tolerance band and packs per minute together.
- 2Match the conveyor and reject type to your pack
Light sachets need air-blast rejection; rigid boxes suit pusher arms; unstable bottles need clamping transport; crates and heavy cartons need powered rollers with swing-wheel or lift-transfer rejects.
- 3Check the environment: washdown, temperature, dust
Frozen-food and seafood lines need washdown-rated stainless construction. Flour and powder environments affect load cells. Tell your supplier the cleaning regime up front.
- 4Decide what else the machine must do
Weigh-price labeling, barcode reading, inkjet coding, metal detection or X-ray can share one frame — a combined unit costs less and takes half the floor space of separate machines.
- 5Verify with your actual product before paying
A datasheet cannot prove your tolerance is achievable. Send samples; a serious factory will run them at your line speed and send back the statistics — including when the answer is no.
Dynamic checkweigher vs static scale: which do you need?
A static scale weighs one item at rest and depends on an operator; a dynamic checkweigher weighs every pack in motion, judges it automatically and rejects failures without stopping the line. If you produce more than roughly 20 packs per minute, or your compliance scheme requires 100% weight control, you need dynamic.
| Static scale | Dynamic checkweigher | |
|---|---|---|
| Coverage | Samples only | 100% of production |
| Throughput | Operator-limited | Up to 300 m/min |
| Judgement | Human reads display | Automatic accept / reject |
| Records | Manual logs | Batch statistics, USB export |
| Compliance | Spot-check evidence | Exportable records for facility BRCGS / HACCP documentation |
Belt-Fed Combination Weighers
A belt-fed combination weigher portions sticky, fresh, delicate and irregular products by combining multiple small weights toward a target. The MQ-MW2512B12 uses 12 independent belt-fed weighing heads and is configured around the actual product, target portion and required throughput; sample testing is recommended before final selection.
Automatic Checkweighers
In-motion weight inspection from ±0.02g, auto rejection
High-Precision Tablet Checkweigher
- Weighing range: 1-1000g
- Weighing accuracy: ±0.03-0.1g
High-Precision Multi-Lane Checkweigher
- Weighing range: 0.1-100g
- Weighing accuracy: ±0.02-0.05g
Scraper-Type High-Precision Multi-Lane Checkweigher
- Weighing range: 0.1-100g
- Weighing accuracy: ±0.02-0.05g
Food Missing and Extra Content Checkweigher
- Weighing range: 1-3000g
- Weighing accuracy: ±0.3-2g
High-Speed Dynamic Book Checkweigher
- Weighing range: 1-5000g
- Weighing accuracy: ±0.5-3g
Automatic Checkweigher
- Weighing range: 0.05-30kg
- Weighing accuracy: ±3-10g
Integrated Vision Inspection and Checkweighing Machine
- Weighing range: 1-1000g
- Weighing accuracy: ±0.05-0.3g
Powered Roller Checkweigher
- Weighing range: 1-30kg
- Weighing accuracy: ±15-30g
High-Precision Belt-Type Combination Weigher
- Combined weighing accuracy: ±0.1-3g
Home Appliance Carton Checkweigher
- Weighing range: 0.05-50kg
- Weighing accuracy: ±5-20g
High-Precision Carton Checkweigher
- Weighing range: 1-80kg
- Weighing accuracy: ±10-30g
Weigh-Price Labeling Machines
Weigh, print and apply labels in one pass, MES/ERP ready
Non-Contact Automatic Weighing, Instant Printing and Labeling Machine
- Weighing range: 1-5000g
- Weighing accuracy: ±0.5-2g
Automatic Scanning, Weighing, Instant Printing and Labeling Machine for Enameled Wire
- Weighing range: 10g-50kg
- Weighing accuracy: ±0.5-2g
Fully Automatic Weighing, Instant Printing and Side-Labeling Machine for Outer Cartons
- Weighing range: 1-30kg
- Weighing accuracy: ±0.5-2g
Automatic Weighing and Instant Print-and-Apply Labeling Machine
- Weighing range: 10g-50kg
- Weighing accuracy: ±0.5-2g
Instant Print-and-Apply Labeling Machine
- Labeling accuracy: ±2-10mm
Logistics Weighing (DWS)
Parcel weighing at up to 120 m/min for e-commerce hubs
High-Speed High-Precision Automatic Weighing Machine
- Weighing range: 1-5000g
- Weighing accuracy: ±1-5g
High-Speed Logistics Scale
- Weighing range: 1-60kg
- Weighing accuracy: ±10-20g
High-Speed Logistics Scale (Dual-Platform)
- Weighing range: 200g-50kg
- Weighing accuracy: ±50g
Metal Detection
Fe / non-Fe / SUS detection, combo units available
Combined Metal Detector and Checkweigher
- Weighing range: 1-2000g
- Weighing accuracy: ±0.3-1g
Metal Detector
View Specs & Price →
Aluminum Foil Metal Detector
View Specs & Price →
Metal Separator
- Ferrous (Fe) detection accuracy: MQ-MC-25:0.1~0.2mm; MQ-MC-30:0.2~0.3mm; MQ-MC-50:0.3mm; MQ-MC-70:0.5mm; MQ-MC-100:0.8mm
X-Ray Inspection
Detects metal, glass, ceramic, stone — plus missing parts
Standard X-Ray Inspection System for Bagged Products
- Empty-machine detection accuracy: SUS ball: 0.4 mm; glass: 1.0 mm; ceramic: 1.0 mm; SUS wire: 0.2 × 5 mm
High-Precision X-Ray Inspection System for Bagged Products
- Empty-machine detection accuracy: SUS ball: 0.4 mm; glass: 1.0 mm; ceramic: 1.0 mm; SUS wire: 0.2 × 5 mm
Rotary Sorting Scales
Forward/reverse belt sorting for small packaged goods
Weight Sorters
Multi-grade sorting up to 20 grades, IP65 washdown options
Swing-Arm Weight Sorting Machine
- Weighing range: 1-2000g
- Weighing accuracy: ±0.3-2g
Dual-Layer Seafood Weighing and Sorting Machine
- Weighing range: 1-2000g
- Weighing accuracy: ±0.3-2g
Rotary Disc Weight Sorting Machine
- Weighing range: 1-200g
- Weighing accuracy: ±0.3-2g
Dual-Channel Crayfish Weight Sorter
- Weighing range: 1-200g
- Weighing accuracy: ±0.3-2g
Custom Solutions
Explosion-proof, dual-lane, bottle-clamping & more
Roller-Type Inkjet Coding and Weighing Machine
- Weighing range: 1-30kg
- Weighing accuracy: ±10-30g
Precision In-Line Checkweigher for Assembly Lines
- Weighing range: 1-3000g
- Weighing accuracy: ±0.5-2g
Automatic Weighing, Vision Positioning and Instant Print-and-Apply Labeling Machine
View Specs & Price →
Three-Axis Instant Print-and-Apply Labeling Machine
View Specs & Price →
Automatic Weighing and Labeling System for Packaging Lines
View Specs & Price →
Static Weighing and Printing System for Logistics
View Specs & Price →
Explosion-Proof Scale
View Specs & Price →
Multi-Function Rejecting and Diverting Checkweigher
View Specs & Price →
Dynamic Inkjet Coding Checkweigher
View Specs & Price →
Dual-Channel Dynamic Checkweigher
View Specs & Price →
Automatic Bottle-Clamping Checkweigher
View Specs & Price →
Air Cargo Container Weighing Machine
View Specs & Price →Packing Machines
Weigh-count-pack lines for fasteners and hardware
Applications by industry
Multi-pack and missing-item detection, washdown stainless builds, and metal-detector combos that can support a facility's documented HACCP procedures.
±0.02 g multi-lane checkweighing catches one missing tablet in a blister card; 100 recipes with permission levels.
In-motion parcel weighing with optional barcode, printing, labeling and sorting integration; length-width-height needs a separate dimensioner.
Roller checkweighers to 80 kg verify bag weight and case counts for grain, feed, fertiliser and chemicals.
Swing-arm and disc sorters grade crayfish, fillets and portions into up to 6 weight bands at 300 m/min.
Aerosols, bottles and gift sets — leak detection by weight, clamping conveyors for unstable containers.
Selection, Testing & Integration Guides
How Does a Checkweigher Work? Infeed, Dynamic Weighing and Automatic Rejection
A dynamic checkweigher weighs every moving pack, compares the filtered result with recipe limits and removes or records exceptions. This engineering guide explains the complete three-stage process, the load-cell signal chain and the line conditions that determine repeatability.
Checkweigher Reject Systems: Air Blast, Pusher, Flap, Arm, Wheel or Stop Alarm
The best checkweigher rejector is the one that removes the real product reliably at the real speed. Compare six mechanisms by product mass, stability, line rate, available air, hygiene and fail-safe confirmation requirements.
Food Metal Detector Testing, Sensitivity and Validation: A Line-Side Guide
A meaningful food metal detector test uses certified ferrous, non-ferrous and stainless-steel test pieces in the actual product, at the least favourable position, and confirms both detection and rejection. This guide separates routine verification from validation and explains product effect.
In-Motion Parcel Weighing and DWS Integration: What Each Module Does
A dynamic parcel scale captures actual weight; a dimensioner measures length, width and height; a scanner binds the record to a parcel ID. This guide shows how to specify the weighing conveyor, data interface and optional print, label and sort functions without confusing a scale with a complete DWS cell.
Weigh-Price Labeling vs Weigh-Print-Apply: Functions, Data and Compliance
A weigh-print-apply system captures weight and prints or applies configured data. A weight/price labeler also calculates selling price from weight and unit price, which can trigger legal-metrology requirements. Use this comparison to define the exact function before buying hardware.
Weight Grading vs Checkweighing vs Batching for Fish, Poultry and Seafood
A checkweigher decides whether a completed pack is within limits; a weight grader routes individual products into multiple weight classes; batching selects or combines pieces toward a pack target. Choosing the wrong function creates the wrong conveyor and yield strategy.
Checkweigher FAQ — answered by the factory
How much does a checkweigher cost?+
Checkweigher price depends on product range, dynamic accuracy at real speed, platform dimensions, conveyor and reject layout, hygiene construction, records and line integration. Compare quotations only when these inputs are the same. MIQI prepares a project quote after reviewing product samples or complete sample data.
What accuracy can a dynamic checkweigher actually achieve?+
MIQI's highest-precision models reach ±0.02–0.05 g dynamic accuracy (MQ-CWP6 multi-lane), pharma single-lane machines ±0.03–0.1 g, food-line machines ±0.3–3 g, and heavy-carton machines ±5–30 g. The number that matters is accuracy at your line speed with your product — which is why we run free sample tests and send you the batch statistics before you order.
How does an inline checkweigher work?+
Three belts in sequence: an infeed belt spaces the packs, a weighing belt on load cells captures the weight in milliseconds while the pack moves, and a discharge section carries a reject mechanism. The controller compares each weight to preset limits and fires the reject on a timed delay, so out-of-tolerance packs are removed without stopping the line. Batch statistics are stored and exportable by USB.
Which reject mechanism should I choose?+
Air blast for light sachets and sticks (no mechanical contact); pusher rod for rigid boxes and cartons; swing arm for continuous flows at speed; drop flap for small round items; flip plate for flat packs; lift-and-transfer or swing wheel for crates and heavy cartons on roller conveyors. MIQI fits any of these to the same machine — chosen after we see your pack, not from a catalogue default.
Can I combine a metal detector and checkweigher in one machine?+
Yes. The MQ-MCL4530L2 combines tunnel metal detection and dynamic checkweighing on one frame with a single reject point: range 1–2000 g, accuracy ±0.3–1 g, one operator interface and one set of audit statistics. A combined unit costs less than two separate machines and takes roughly half the floor space. Its inspection records may support a facility's documented HACCP procedures; the machine itself is not HACCP certified.
Are Chinese checkweighers reliable?+
Judge the factory, not the flag. Ask for: a live video of your own product running on the actual machine with the accuracy statistics visible; verifiable CE certificate numbers; the warranty in writing (MIQI: 2 years, lifetime technical support); and named spare-parts response times. MIQI is the manufacturer — not a trading company — so engineering questions are answered by the people who built the machine, and spare parts ship from the source.
How do I verify checkweigher accuracy for a BRCGS / HACCP audit?+
Verify dynamically under the plant procedure: use controlled reference packs or suitable masses, run them at production speed and spacing, record individual results, and challenge the reject path. The facility sets the interval from risk, validation, customer requirements and applicable rules; there is no universal 30-minute interval for every line.
Which checkweigher do I need for my product?+
Send us four numbers and a photo: target weight, tolerance band, packs per minute, and pack dimensions. We reply the same day with the matching model and an exact quotation, and run your actual samples on the machine — free — with video and statistics, including the honest cases where your tolerance is not achievable at your speed. WhatsApp +86 152 1890 9599 or 897874196@qq.com.
Technical content reviewed by Engineer Cai, Guangdong Miqi M&E Technology Co., Ltd. · Updated August 31, 2026
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