Durable, I67-rated meters feature a 100% waterproof and easy-to-clean keypad. Silicone rubber keys provide tactile feedback for error-free operation. The large graphic display allows for excellent readability even under difficult lighting conditions. A built-in calibration timer ensures more reliable results. Meter provide extended data memory for logging up to 5000 GLP-compliant data sets. Time-controlled datalogging function offers adjustable data collection intervalsideal for long-term field monitoring. A special "sleep" mode saves power and extends battery life when performing long-term monitoring. Nonvolatile memory saves all stored data even if battery power is lost. Data transfer to PC is made simple via the unique waterproof mini-USB interface. Meters include: CD-ROM and four AA batteries. Meter kits add: specified probe, calibration solutions, stand, beaker, and hard carrying case.