EL-USB-1 (shown above)
The Lascar EasyLog EL-USB-1 temperature datalogger (formally part no. QP6012) is only 100mm long and 26mm in diameter and stores up to 16,382 temperature readings in the range from -35 to 80 degrees C (-31 to 176°F) with an resolution of 0.5°C or 1°F. The typical accuracy is +/- 1°C (+/- 2°F). NOTE, the repeatability is good so a calibration curve could be used for greater accuracy! To upload the temperature readings the unit plugs directly into any USB port and, with the software for Windows 98, 2000, XP and Vista (32 bit) provided, allows the capture rate (10 seconds or 1, 5, 30 minutes or 1, 6, 12 hour intervals), high and low alarms and the start date and time to be set. Two LEDs (lamps) on the EL-USB-1 indicate the status and alarm conditions. The high and low alarms may be set to latch so that the alarm conditions are never missed. The unit then operates for up to one year* (with the 1/2AA 3.6V lithium battery provided) independently of the PC. When the protective cap is fitted, the unit is environmentally protected to the IP67 standard (this is the 'International Protection' rating against dust and moisture - for the IP code click here). The EL-USB-CASE is available with rugged metal alloy design for harsh conditions (waterproof to IP-67/NEMA-4X). The EasyLog USB Windows software (currently version 5.45) allows the uploaded temperature data to be graphically displayed, printed and exported to reports or to Excel (or other applications) for more detailed analysis and customization of the graph (an Excel macro is provide). An ideal device for recording temperatures around the home, office or factory - clip it onto any thin flat surface or screw it to a wall etc. Log temperatures inside refrigerators (for health department purposes) or during movement or shipment of goods. A multitude of applications await this device in engineering, medical, technical and research and scientific areas as well as environmental monitoring (in agriculture, horticulture, building/warehouse/museum/art gallery temperature recording etc.) and food handling and processing etc. Note, any acquired data is retained in flash memory even with a dead battery. Also see 'Tips on measuring temperature' below. *Depending on sample rate, ambient temperature and use of alarm LEDs. For low temperatures (down to -200°C) or high temperatures (up to 1300°C) see the EL-USB-TC thermocouple (J, K or T type) datalogger. This logger is also capable of logging at 1 second intervals! For water-proof applications use the EL-USB-CASE or the EL-USB-1-PRO with 32,510 temperature readings in the range -40 to 125 degrees C (-40 to 257°F) with an resolution of 0.1°C or 0.2°F - capable of logging in 1 second intervals and logs at 1 hour intervals for up to 3 years! The new EL-USB-1-LCD is now available with LCD display!

EL-USB-2 (shown above)
The Lascar EasyLog EL-USB-2 temperature and relative humidity datalogger is similar in size and specifications as the EL-USB-1. It logs up to 16,382 temperature readings and 16,382 humidity readings (that also means up to 16,382 dew point readings). The humidity measurement range is 0 to 100% with a resolution of 0.5% and an accuracy of +/-3% over the 20 to 80% range. The typical temperature accuracy is +/- 0.5°C (+/- 1°F). It also has two LEDs (lamps) that indicate status and alarm conditions for both temperature and humidity. Click here for a graph of temperature, humidity and dew point using the EasyLog USB software supplied. The graph also shows the high and low alarms! A more accurate model, the EL-USB-2+ which features delayed logging (start at a later time & date), and the EL-USB-2-LCD with LCD display are now available.

For a 'real-time' model that logs direct to the PC from any USB port, see the EL-USB-RT. Capable of alerting you through emails, a text message on-screen or computer beep of a high or low alarm condition! An Application Programming Interface (API) will also be available soon for the EL-USB-RT so you can write your own software! e.g. access the data directly in Excel in 'real-time'. The EL-USB-RT is great for computer server room monitoring! And can provide a low-cost way to obtain temperature & humidity throughout a building when a network of computers is already installed! Or use it to access temperature & humidity over the internet.

EL-USB-2-LCD (shown above)
The NEW Lascar EasyLog EL-USB-2-LCD unit is similar to the EL-USB-2 with temperature and relative humidity logging capability. The EL-USB-2-LCD provides an LCD display of the last logged temperature and humidity readings and the minimum and maximum values logged. It also provides a rolling-data capture capability, which can be turned on or off, such that old data is overwritten by new data. This provides an excellent fault finding capability... set it to log at the maximum rate (every 10 seconds) and then, only when necessary, grab the unit and upload the last 45 hours of temperature and humidity readings! Another important feature provided on this unit is a press-to-start operation. Now you can position the unit before starting the data logging operation (however long it takes). This unit is ideal for use in indoor applications such as in museums and art galleries and other environments where temperature and humidity records must be kept. Click here for casestudy of museum archive.