Beautiful HEATHKIT CM-1551 digital engine analyzer with CMA-1550-1 400 Ampere shunt accessory. In original Heathkit box with manuals. Requires standard 9 Volt battery for portable operation (not included) and unused cable for AC operation. Appears to have not been used but cannot test. Offered as is. Buyer to pay shipping. Note three shipping options. Thank you for looking !!!