Powered by rechargeable lithium ion battery or used with USB wall charger, portable Lascar EL-BT-2 measures temperature from -4 to +140°F and humidity from 0%–100% RH and stores up to 500,000 readings in internal memory. LCD screen shows Bluetooth® connection status as well as logger operation, while pushbutton operation let users cycle through Current, Min, and Max recorded values. Using complementary Android app, users can also setup and download data.