The BT521ANG is an advanced battery analyzer from Fluke's 500 Series, equipped with angled intelligent test probes featuring an integrated LCD display for comprehensive battery testing. It measures internal battery resistance (3 mO to 3000 mO range), DC and AC voltage (up to 1000 V), DC and AC current (up to 400 A with i410 accessory), AC ripple voltage (up to 6000 mV), frequency (up to 500 Hz), and temperature (0°C to 60°C with BTL21 probe). The instrument supports automatic or manual sequence testing of battery strings with automatic measurement storage, threshold comparison with visual and audio feedback, wireless communication for data download and remote display via iOS app, and stores up to 100 profiles with 450 batteries each. The BT521ANG is ideal for maintenance, troubleshooting, and performance testing of individual stationary batteries, offering reduced testing complexity, simplified workflow, and enhanced data analysis capabilities with included battery management software.