1.[Accurate Measurement] : The tape cartridge gauge can accurately measure tape guide height, head travel and head zenith. 2.[COMPATIBILITY]: Suitable for Studer ReVox/TEAC/BASF/Nagar models. 3.[Durable Material] : Made of high quality metal for durability. 4.[Easy Installation]: Cassette gauge is easy to install and has a long service life. 5.[Magnetic head]: Magnetic head is engraved on the measuring plate for reliable measurement. Parameter: High Precision Cassette Gauge (Magnetic Head and Guide Gauge) This is a cassette gauge with calibration rods. The main plate is precision machined from two stainless steel rods. The calibration rods are made of stainless steel. The gauge allows the user to set the tape guide height, head depth (depth of insertion into the cartridge) and head zenith (tilt). Name: High Precision Cassette Gauge (Head and Guide Gauge) Colour:Silver Material:Alloy Package Contents: 1x High precision cassette gauge 2x measuring rod Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.