Used THERMO SCIENTIFIC Orion 3 Star

Easy-to-use single-channel meter with improved stability algorithm to increase calibration and measurement accuracy. Reliable, accurate pH measurement for any general laboratory or QC application.
Displays pH or mV and temperature measurements simultaneously
Bright LCD display with ready indication Convenient built-in Quick-Start Guide
Automatic or manual calibration with 1 to 5 calibration points
Auto-Buffer Recognition (ABR) of DIN and NIST/US buffers
Offers a full complement of GLP-related features
Stores up to 10 password protected methods, including setup parameters and calibrations; download additional methods and software updates via the Web
Average slope and slope of segment printed with measurement
New individual methods passwords
1000 point datalogger, downloadable to printer or computer via an optional RS-232 or USB interface accessory; can be switched off
SMART STABILITY™ and SMART AVERAGING™ functions automatically optimize accuracy, precision and response time
ATC temperature calibration
Auto stirrer control; capable of operating an autosampler
IP54 dustproof and splashproof
Mini-DIN locking probe connectors
Advanced self-tests on meter operation, self-diagnostics
Universal power adapter for worldwide operation