What Is Serial Number Tracking?
Serial number tracking is an inventory control method in which each individual unit gets a unique serial number. That number is recorded on every transaction, from receipt through sale, warranty, and service.
How Serial Number Tracking Works
Serial tracking builds a complete history for each unit in four steps:
A Unique ID for Each Unit
The manufacturer's serial number is used, or one is assigned and labeled when the unit is received or built.
Scanned on Every Transaction
Receipts, transfers, picks, shipments, and returns all record which serial numbers moved.
Linked to Customers and Orders
Each shipped serial is tied to the sales order, invoice, and customer who received it.
History for Warranty and Service
After the sale, warranty claims, repairs, and replacements are logged against the same serial number.
Serial Number Tracking Example
A distributor of commercial espresso machines sells a unit to a café. Eleven months later, the café calls about a faulty pump. This is the history for serial number EM-24-00817:
| Date | Event | Document | Details |
|---|---|---|---|
| Oct 3, 2025 | Received | PO-4471 | From manufacturer, supplier lot M2509, bin R-04-2 |
| Oct 20, 2025 | Sold and shipped | SO-18832 | To Harbor Street Café, 12-month warranty starts |
| Sep 15, 2026 | Warranty claim | RMA-2290 | In warranty Pump failure, 11 months after sale |
| Sep 19, 2026 | Repaired | SVC-0612 | Pump replaced with part serial PP-88104 |
| Sep 20, 2026 | Returned to customer | RMA-2290 | Claim closed, no charge |
The serial number confirms the machine was sold by this distributor and is still within its 12-month warranty, so the claim is approved on the first call. If the manufacturer later recalls pumps from supplier lot M2509, the distributor can list every affected serial number and the customer who has it.
Serial Number Tracking vs. Lot Tracking
Both methods make inventory traceable. The difference is how many units share one number.
| Serial Tracking | Lot Tracking | |
|---|---|---|
| Identifies | One unit | A batch of units |
| Quantity per Number | Always 1 | Many |
| Typical Products | Equipment, electronics, appliances, devices | Food, chemicals, cosmetics, raw materials |
| Main Uses | Warranty, service, theft control | Recalls, expiration, quality control |
| Effort per Transaction | Higher, one scan per unit | Lower, one scan per lot |
Some products need both. Learn more in our guide to lot tracking.
Benefits of Serial Number Tracking
Faster Warranty Decisions
The sale date and customer are on record, so claims are approved or declined without guesswork.
Fewer Fraudulent Returns
Returns are checked against the serial that was shipped, so a different or used unit can't be swapped in.
Targeted Recalls
Only the affected units and customers are contacted, supporting inventory traceability.
Loss and Theft Control
A missing unit can be identified by serial number and traced to its last recorded location.
How to Start Serial Number Tracking
- 1Choose which items to serialize. Start with high-value, warrantied, or serviceable products.
- 2Decide on the serial source. Use the manufacturer's number where it exists, or set a numbering format for serials you assign.
- 3Capture serials at receiving. Scan each unit into the system before it is put away, so on-hand stock is known by serial.
- 4Require a serial on every movement. Transfers, picks, and shipments should not complete until the serial is scanned.
- 5Link returns and service to the serial. Look up every return and repair by serial number to confirm the sale and warranty.
- 6Count by serial. During cycle counts, scan serials instead of counting units, so missing and extra units are named.
Common Serial Tracking Mistakes to Avoid
A serial history is only useful if it has no gaps.
Capturing Serials Only at Shipping
Without a serial at receiving, you can't tell which supplier shipment a unit came from.
Typing Serials by Hand
Long alphanumeric IDs are easy to mistype. Use barcode or QR labels and scanners.
Serializing Everything
Low-value consumables add scanning work with little payoff. Use lot tracking or none at all for those.
Accepting Returns Without a Serial Check
If the returned serial isn't matched to the original sale, the wrong unit can end up back in stock.
Which Industries Use Serial Number Tracking?
Serial tracking is most common where individual units carry high value or long service lives:
Distribution
Equipment, electronics, and tools sold with manufacturer warranties.
Manufacturing
Finished machines and assemblies, with serialized components recorded on each build.
Healthcare
Medical devices and equipment that must be traced to the patient or facility.
Furniture & Home Decor
Appliances, lighting, and powered furniture covered by warranty.
Serial Number Tracking in Kechie ERP
Kechie Inventory Management records serial numbers on receipts, transfers, and shipments, so every unit has a searchable history. Because order management, returns (RMA), manufacturing, and accounting share the same data, a serial number looked up on a return shows the original order, customer, and invoice right away.
Frequently Asked Questions
What is serial number tracking in simple terms?
Serial number tracking gives every unit its own ID and records that ID each time the unit is received, moved, sold, returned, or serviced, so you always know where a specific unit is and where it has been.
What is the difference between serial and lot tracking?
Lot tracking groups many units made or received together under one lot number. Serial tracking gives each unit its own number. Serial tracking follows one unit; lot tracking follows a batch.
Which products should be serialized?
Serialize items that are high in value, carry a warranty, need service over their life, or must be traced individually for regulations. Examples are equipment, electronics, appliances, tools, and medical devices.
Can an item have both a lot and a serial number?
Yes. Many products carry a lot number for the production batch and a serial number for the individual unit. A medical device is a common example.
When should serial numbers be captured?
At receiving or production completion, and again on every transfer, shipment, return, and service event. Capturing serials only at shipping leaves gaps in the history.
How does serial tracking help with warranty claims?
The serial number shows when the unit was sold and to whom, so you can confirm whether it is still under warranty and whether it was actually purchased from you.
What is the difference between a serial number and a SKU?
A SKU identifies a product type, such as one model of espresso machine. A serial number identifies one physical unit of that product.
Do you need barcode scanners for serial tracking?
They are not required, but they are strongly recommended. Scanning serial numbers is faster and avoids the typing errors that come with long alphanumeric IDs.
Related Guides
See Serial Number Tracking in Kechie ERP
Follow every unit from receipt to sale, warranty, and service in one system.