The Orion 2-Star benchtop pH meter features a simple push-button keypad and a pullout quick-start guide. One, two and three-point calibration is offered; along with auto calibration compatible with NIST and DIN buffers; and a 50-point data log that allows information to be stored within the unit. Multiple package configurations to adapt to any environment, and include: refillable epoxy Triode, pH ATC, which provides 3-in-1 temperature compensation and an unbreakable body; epoxy body AquaPro pH, gel, a low maintenance, fast response unit; refillable glass pH and stainless steel body ATC; and others.