SPI Supplies Brand Quartz Crystals for Quartz Crystal Thickness Monitors Pack(2) Crystals

SPI Supplies Brand Quartz Crystals for Quartz Crystal Thickness Monitors Pack(2) Crystals:

SPI Supplies offers the finest gold coatings applied to the highest quality electronic grade quartz money can buy, to create the SPI Control Quartz Crystals for quartz crystal thickness monitors.

For quartz crystal thickness monitors manufactured by SPI Supplies, Polaron Equipment Ltd., Watford, UK (before 1982), and by Bio-Rad Laboratories Microscience Division (1982-1992). Crystals are gold coated, 0.490" (12.4mm) diameter x 0.013" (0.33mm) thick, for operation at 5 MHz. These crystals are specially designed for use in above thickness monitors and might not work in other monitors depending on the electrode placement.