Product Description
This item is a Mark-Tech Laser detector with built-in beam-splitter. The detector portion is centered on the "off-axis" position with the pass-through clearance allowing access to a second detector located independently on the optic axis. The model number is 6421-ST, and the serial number 166 is close to that of several other Mark-Tech Laser components we have on offer (#165). Date of manufacture is mid-1988.
The detector does not include the cable or the readout unit. The mounting sleeve for the device is 1.25 inches in diameter, and it is fitted with four detents spaced in the half-way positions between the Horizontal and Vertical markings on the device. The detector appears to measure in quadrature, with plus or minus horizontal and plus or minus vertical markings on the housing.
Photo set 1187