The PiranhaMax 175 PT is also an inexpensive fish finder. On most dealers it’s usually under $140. Evidently with the small price also comes a smaller number of options.
First of all, it’s a monochrome fish finder. It features a 4-inch diagonal display, 16 level grayscale, with a 240×160 pixel resolution. However, it provides all the features needed for tracking fish and improving your data gathering for your fishing conditions. In other words, it measures depth and water temperature