The Vintage LOWRANCE Electronics 1970's Fish-N-Temp is a portable handheld fishfinder designed for outdoor fishing activities. This device, powered by batteries, features a temperature sensor for accurate readings. Made by Lowrance in the United States, this vintage piece of sporting goods equipment is a collectible item for fishing enthusiasts looking for a retro piece of technology to add to their collection. With its compact size and English language interface, this Fish-N-Temp system offers a unique glimpse into the fishing equipment of the 1970s. this unit is a temperature device. the line uncoils and has depth markers. i unwound to about 85ft and there was still more. i am guessing it will have 100ft of line. the low scale works great. the high side is "jittery". i think the switch has a bad connection.