Auto Meter BVA-300 40 Amp Hand-Held Battery and Electrical System Micro-Processor Tester Tests flooded, deep cycle, and AGM batteries with CCA range of 100-1600 - also detects discharged batteries, bad cells, and has built in reverse polarity protection. Unlike competitor models, Auto Meter testers only require a single technician to run a full electrical system test due to our on-board 40 amp True Load cell. This eliminates the need to apply inconsistent loads, such as headlights, fans, etc. which makes our products easier to use and more accurate. Automatically stores the last 100 tests in memory. 30" - 16 gauge leads with professional grade clamps that are easily field serviceable. Customer communication with optional PR-12 (external printer), PR-20 (bolt-on printer), or AC-12 (PC cable).