Starrett 2900 Series Indicators are equipped with RS232 output and compatible with 2900 SCM, SCU and SCKB cables, while Starrett W2900 Series Indicators, which have all the same features and capabilities of the 2900 series, are fully wireless and equipped to send data for SPC analysis at the push of a button with no cables required. Both the 2900 and W2900 series are available in ½ “, 1”, 2” ranges and new 4” range models, inch-metric models in 1/2", 1", 2" (12 mm, 25 mm and 50 mm) and metric only models in 12 mm, 25 mm and 50 mm ranges.