Ensure the net height meets professional standards with the Net Checker (Pickleball)! This retractable net height gauge is a quick. portable and easy device to accurately measure the height of a pickleball net and ensure it complies with ITP regulations. A red line on the tape at 34" / 86.4cm marks the required height a tennis net should adhere to at the center. Pull the tab to release and press gently to retract.