There is a button on the fishline counter that can be pressed or released to adjust the length of the line so it doesn't hurt your hand.With this line counter, depth measurements up to 999m are possible.This mechanical fishline counter can record the length of the line, a total of 0-999 meters, counted by the number of turns. Mechanical line meter can realize the function of two-way measuring line length! This mechanical fishline counter can be used with fishing rod. It adopts mechanical measurement with high precision. It can measure the reading of retracting and retracting. Unless your fish is very large and you operate with violence, the counter is pretty solid.The housing is also impact-resistant and can therefore withstand rough sea conditions. Fishing Line Depth Finder Counter have small size design and lighweight which is portable and easy to carry in outdoor fishing activities. Comfortable rod attachment system can be attached tothe rod in seconds. It can be used for squid fishing, boat fishing, etc. When the fishing is fixed, the counter can accurately grasp the fish layer. SIZE: Fishing line counter for spooling : 0-999 meters Material: plastic Size: 5.5cm x 6cm or 2.16'' x 2.36'' (approx.) Color: black, orange