BUILT STURDY, TOUGH! UNBELIEVABLY FORGIVING! Strong construction and intelligent design have earned the 100 series recognition and praise throughout the industry. Features include double seals and a removable cover. Proven reliability and on-site serviceability make the 100 series ideal for applications in tough environments. 100 series 115IM(2 µm) [0.0001 inch], 135IM (5 µm) [0.0002 inch], 105IM (10 µm) [0.0005 inch] measuring standard glass scale grating period 16 µm (62.5 lines/mm) accuracy at 20ºC (68ºF) ±16 µm/m (±250 micro inch/ft) cable lengths 3.3 m (11 ft), 7.6 m (25 ft), or longer upon request signal output 5 V TTL compatible quadrature square waves