Available with the BT520ANG and BT521ANG, or as a standalone accessory, the BTL20ANG intelligent test probe kit makes the Fluke 500 Series battery analyzers ideal test tools for maintenance, troubleshooting and to measure performance of individual batteries and battery banks used in critical backup -up applications for batteries. With optimized probe angles and coil placement, the BTL20ANG gives you the maneuverability you need to avoid obstacles and get into tight cabinet spaces, all while offering the same CAT II 1000V and CAT III 600V you've come to expect from Fluke battery analyzers.