1.Perfect self-checking function 2.Lmmunity 3.Durable life 4.Good anti-vibration and easy to use 5.Self-locking function Protection range, 0-12000mm (2 sides), 0-8000mm (3 sides);Specification STQxx10 (xx=24, 32, 40, 48……136) STQxx20 (xx=08, 12, 16, 20……72) STQxx40 (xx=04, 06, 08, 10……40) STQxx80 (xx=02, 04, 06, 08……40)Light axis pitch10mm, 20mm, 40mm, and 80mmProtection height Height=(xx-1)× ...