Fowler's Bluetooth Holematic Pistol Grip Groove Sets offer extended travel with fixed anvils. The pistol grip handle incorporates a constant measuring pressure to eliminate operator "feel". Specifications include... 0.750" - 2" / 19-50mm Measuring Range 0.00005" / 0.001mm Resolution 3 Heads, 1 Handle, 2 Rings Measuring Heads... 0.750" - 1.00" Anvil Step Height: 0.108" Anvil Contact Width: 0.079" 1" - 1.375" Anvil Step Height: 0.217" Anvil Contact Width: 0.079"" 1.375" - 2.00" Anvil Step Height: 0.157" Anvil Contact Width: 0.079" Special Features: Simple, two button operation Large easy-to-read swivel display Self-centering heads RS-232C output Two preset memories Non-removeable anvils All gages and heads are serialized Tungsten carbide measuring faces on all 3-point heads from .5" (12.5mm) and up. Setting rings included in all sets Includes UKAS certificates for all pistol grips and rings. Send data directly to a Bluetooth cell phone or Tablet with the FREE Sylvac BT Smart app. To be able to send data to a PC, you will need to also buy the Fowler USB Bluetooth Receiver for that PC. You can have up to 8 different gages sending data to the 1 PC through this Bluetooth Receiver.