The Lascar EL-USB-2 is a compact data logger for buyers who need a record of temperature and relative humidity, not just the number visible at one moment. In a 3D printing workspace, that record can help audit a filament cabinet, compare storage changes, track a printer room through seasonal swings, or find out whether a suspected humidity problem is brief or persistent.
The current listing identifies a measurement range of 0 to 100 percent relative humidity and -35 to 80 degrees Celsius (-31 to 176 degrees Fahrenheit). It also lists dew-point indication through the Windows control software, a USB interface for setup and data download, user-programmable temperature and humidity alarm thresholds, red and green status LEDs, IP67 environmental protection, and a replaceable internal lithium battery.
Short answer
The EL-USB-2 is a strong fit for a maker who wants a self-contained logger that can be configured, left in place, and later plugged into a Windows computer for review. Its buyer angle is independence from a phone connection while it records and a straightforward USB handoff when the test is finished.
It is a weaker fit if you want an always-visible screen, live phone alerts, cloud dashboards, or painless checks from several locations every day. The USB workflow is deliberate: deploy the logger, let it collect a history, retrieve it, and inspect the data. That is useful for an audit or comparison, but less convenient for someone who wants to glance at current humidity from across the room.
What problem does this logger solve?
A display hygrometer can tell you what the air is doing when you look. It cannot show what happened overnight, how quickly a cabinet recovered after its door opened, or whether desiccant performance degraded over several days. A data logger fills those gaps by turning isolated readings into a timeline.
That timeline can support several useful shop decisions:
- whether a filament cabinet needs a better seal or more desiccant
- whether a storage location experiences large day-and-night swings
- whether moving a box away from a wall, window, or HVAC outlet improved stability
- how long a cabinet takes to recover after loading and unloading spools
- whether a dryer, dry box, or room change solved the problem you meant to solve
The logger does not make those decisions for you. Its value is giving you enough history to stop guessing from one convenient reading.
Why USB logging can still make sense
Bluetooth and Wi-Fi sensors are appealing because a phone can show readings without retrieving the device. They also introduce range, pairing, background-app, gateway, account, and notification questions. The EL-USB-2 follows a simpler pattern: configure it with the Windows software, place it where the test matters, then connect it by USB to download the record.
That approach works well for occasional storage audits, before-and-after tests, and areas where radio reception is unreliable. A metal cabinet can weaken wireless signals, while a logger that records internally can keep doing its job inside. The tradeoff is that you do not get effortless live visibility. If the logger is buried behind spools, every retrieval becomes part of the workflow.
Before buying, confirm that the current Windows software supports the computer you will use. Buyers centered on macOS, Linux, Chromebooks, tablets, or phone-only workflows should verify compatibility rather than assuming a generic USB connection means universal software support.
Temperature, humidity, and dew point
Relative humidity changes with temperature, so the two channels should be reviewed together. A sealed container can show a different RH percentage after its temperature changes even when no dramatic amount of moisture entered. Looking at both curves helps separate a room-temperature cycle from a seal or desiccant problem.
The listing also identifies dew-point indication through the Windows software. Dew point can be a useful way to understand the moisture content of the air and condensation risk. It does not, however, measure water inside a filament spool. No room logger can look into the polymer and declare PLA, PETG, nylon, TPU, or PVA dry.
Use the EL-USB-2 to evaluate the storage environment. Judge filament condition with material history, drying guidance, extrusion behavior, and controlled test prints. Popping, rough surfaces, stringing, weak output, or inconsistent extrusion may support a moisture diagnosis, but they can also point to temperature, flow, retraction, contamination, or hardware issues.
Where it fits around a 3D printing setup
Filament cabinets
A cabinet is an excellent use because the logger can reveal slow drift and door-opening events. Position it where it represents the stored air rather than directly against desiccant, a cold exterior panel, or a heater. In a tall cabinet, one position may not describe every shelf, so a useful audit may involve separate runs at different heights.
Dry boxes and storage totes
The EL-USB-2 makes more sense in a roomy multi-spool box than in a tight single-spool container where every centimeter matters. Plan access before loading the box. If you need to break the seal and rearrange several spools each time you retrieve the logger, your test method can affect the condition you are trying to study.
Printer rooms
Room history can show whether a basement, garage, spare room, or workshop swings enough to justify changes in spool storage. Place the logger away from direct sun, open windows, heating vents, dehumidifier outlets, and printer exhaust unless that specific microclimate is the subject of the test.
Printer enclosures
The listing's broad temperature range does not automatically make every enclosure placement safe. Keep the logger clear of toolhead motion, belts, wiring, fans, hot surfaces, and any place where it could fall onto the bed. An air reading is not a substitute for bed, nozzle, motor, electronics, or chamber sensors, and it should never be used to bypass machine thermal protection.
What the alarm thresholds and LEDs add
The listing says temperature and humidity alarm thresholds are user programmable and status is indicated with red and green LEDs. That can make the logger easier to check during retrieval or a walk-by inspection. An LED is not a remote notification, though. It only helps when the unit is visible and you are close enough to see it.
Choose thresholds that connect to an action. A general PLA storage cabinet may tolerate a different band than a box holding nylon or water-soluble support material. The useful question is not which universal number sounds strictest; it is what you will do when the recorded environment crosses your chosen limit.
IP67 protection: helpful, not unlimited
The listing identifies IP67 environmental protection. That gives the logger more environmental resilience than an exposed desk hygrometer, but it does not turn it into a universal probe for every wet, hot, chemical, or food-storage task. Confirm the manufacturer's current instructions, cap position, operating limits, and cleaning guidance for the intended environment.
For regulated, contractual, medical, laboratory, or other high-consequence monitoring, use equipment and calibration procedures approved for that responsibility. A shop logger can support process learning without becoming a certified quality record by default.
Who should buy it?
- makers auditing a filament cabinet or larger dry box over time
- small print shops comparing storage locations or seal improvements
- buyers who prefer internal recording over dependence on a phone connection
- Windows users comfortable with a configure, deploy, retrieve, and download workflow
- people who need temperature, humidity, and software-derived dew-point history in one device
Who should skip it?
- buyers who mainly want a large always-visible display
- anyone who expects remote alerts without retrieving or seeing the logger
- phone-only, macOS, Linux, or Chromebook users who have not confirmed software support
- very small spool boxes where the logger and retrieval process take too much room
- users looking for a direct measurement of moisture inside filament
EL-USB-2 versus a Bluetooth humidity logger
A Bluetooth logger is easier to check when its signal reaches your phone and the app behaves reliably. It is often the better choice for frequent local checks and quick graphs. The EL-USB-2 is more appealing when the job is a defined audit, the recording location may block radio signals, or you want a simple physical USB transfer without maintaining a phone connection.
For several daily-monitored spaces, a wireless ecosystem may scale better. For one cabinet test, a seasonal room study, or a before-and-after seal comparison, the Lascar workflow can be refreshingly focused.
Buying checks before you order
- confirm the listing is the EL-USB-2 temperature and humidity model
- verify current Windows software and driver compatibility
- measure the intended mounting space and plan how you will retrieve the device
- decide whether offline internal history is enough or live remote access is essential
- place it where the reading represents stored air, not a vent, wall, heater, or desiccant pack
- set alarm thresholds and a logging plan tied to a specific decision
- review manufacturer guidance before using it in harsh or high-consequence environments
Final take
The Lascar EL-USB-2 earns its place when you want a durable, self-contained record of temperature and humidity and do not need a live phone dashboard. Its USB setup and download workflow is best suited to storage audits, before-and-after experiments, and printer-room history that will be reviewed deliberately.
Buy it when the timeline matters more than instant remote access and a Windows computer fits your process. Skip it when you need an always-visible display, cloud alerts, or a sensor that works entirely from a phone. Used for the right job, it can turn a vague filament-storage concern into evidence you can act on without pretending that air humidity is a direct filament-moisture reading.
Affiliate link: Check the Lascar EL-USB-2 data logger on Amazon.
Frequently asked questions
Does the EL-USB-2 need to stay connected to a computer?
No. The product is designed as a data logger that is configured and downloaded through USB, then deployed to record away from the computer.
Can it tell me whether a spool is dry?
No. It measures the surrounding air's temperature and relative humidity. It does not measure moisture inside the filament.
Does it send alerts to a phone?
The listing describes programmable thresholds and red and green status LEDs, not a phone-alert system. Buyers who need live remote notification should compare wireless loggers and any required gateways.
Can it be used inside a printer enclosure?
Only when the environment and placement stay within manufacturer limits and do not create a motion, heat, electrical, or falling-object hazard. It does not replace the printer's thermal sensors or protections.
Why choose this over a cheap hygrometer?
Choose it when you need a downloadable history. A cheap display hygrometer is the better value when one current reading is enough.