Measurement range: -20° to 70°C (-4° to 158°F) Alarms: High and low alarms can be configured for total amount of contiguous or non-contiguous time outside of user-defined limits between -20° and 70°C (-4° to 158°F) Accuracy: ± 0.53°C from 0° to 50°C (± 0.95°F from 32° to 122°F), see Plot A in manual Resolution: Temperature: 0.14°C at 25°C (0.25°F at 77°F), see Plot A in manual Drift: Less than 0.1°C/year (0.2°F/year) Response Time Airflow of 2 m/s (4.4 mph): 10 minutes, typical to 90% Water: 5 minutes, typical to 90% Time accuracy: ± 1 minute per month at 25°C (77°F), see Plot B in manualOperating Range In water/ice: -20° to 50°C (-4° to 122°F) In air: -20° to 70°C (-4° to 158°F)Water depth rating: 30 m from -20° to 20°C (100 ft from -4° to 68°F), see Plot C in manual NIST traceable certification: Available for temperature only at additional charge; temperature range -20° to 70°C (-4° to 158°F) Battery life: 1 year typical use: deployments in extremely cold or hot temperatures, or logging intervals faster than one minute, may significantly reduce battery life Battery Type: CR2032Memory UA-001-08: 8K bytes (approximately 6.5K sample and event readings) UA-001-64: 64K bytes (approximately 52K sample and event readings)Materials: Polypropylene case; stainless steel screws; Buna-N o-ring Weight: 15.0 g (0.53 oz) Dimensions: 5.8 x 3.3 x 2.3 (centimeters) and 2.3 x 1.3 x 0.9 (inches) Environmental Rating: IP68; not rated for use in direct sunThe CE Marking identifies this product as complying with the relevant directives in the European Union (EU).