Onset Computer Corp.'s HOBO Pendant Logger is a miniature data logger that records underwater temperature and light levels at depths of up to 100 feet. The HOBO Pendant provides +/-0.5°C accuracy and up to 52,000 readings, making it suitable for long-term deployment. It also features a one-year user-replaceable battery, and an eyelet for easy mounting with cable ties. Onset Computer Corp., Card No. 220