NTG200H FOCUS AND FOLD RIFLE BORESCOPE WITH 4.5-INCH IPS SCREEN MANUAL FOCUS The Teslong Focus and Fold eliminates trial-and-error focusing. Despite its 0.22-inch diameter, we were able to build an internal manual focusing mechanism inside the probe shaft. Now all you do is install the mirror of your choosing, insert the probe tip into the barrel, and adjust the focusing ring until you have a crisp, clean image on your screen. FOLD The new Teslong Focus and Fold borescope probe is collapsible! The probe is threaded in its middle and can fold in half. The wires inside the probe are protected by an abrasion-resistant sheath allowing the probe to fold repeatedly. Our popular Mfg: Teslong