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Five generations of Sinar Moisture Meters
From top left clockwise :
1) 2MHz CDP1802, 8K EPROM, 128 bytes RAM, circa 1980.
2) 2MHz CDP1802, 32K EPROM, 32K RAM, circa 1985
3) 14.7456MHz 80C32 32K EPROM, 32K RAM circa1987
4) 14.7456MHz 80C32 32K EPROM, 32K RAM. surface mount, circa 1995
5) 8MHz MSP430F5529 128K FLASH, 20K RAM 2013, also has USB and an SD card slot.