I just purchased a teslong TD500 that has an adjustable end tip. It’s awesome for looking into heat exchangers. For the price it is a phenomenal camera. But teslong makes some other really cool cameras.https://www.amazon.com/dp/B09ZV7N88H/ref=cm_sw_r_api_i_RXD8QG4908D1XHGPAP76_0?psc=1