The PHTEMP 101 pH and temperature recorder and the PRTemp 1000 Rugged Pressure &Temperature Recorder are designed for composting operations and other applications. Units are battery powered, standalone and provide for remote datalogging. The PHTEMP 101 (shown) is a miniature, battery powered, stand alone pH and temperature recorder. This is an all-in-one compact, portable, easy to use device that will measure and record up to 13,107 measurements per channel. The PRTemp 1000 is reusable, submersible, and user-friendly and offers a programmable start time with real-time operation. The PRTemp 1000 records up to 16,383 pressure and 16,383 temperature measurements.