9 Electric measuring apparatus and instruments, electrical checking [supervision] apparatus and instruments, electrical control apparatus and instruments, including the following products: apparatus for the control and monitoring of cleaning apparatus and devices; measuring or testing machines and instruments; sensors and detectors; piezoelectric sensors; optical sensors; sensors (measurement apparatus), other than for medical use; signalling apparatus and instruments; checking and signalling apparatus; monitoring apparatus and instruments; measuring, detecting and monitoring instruments, indicators and controllers; software; computer hardware and computer software, especially, computer hardware and software for the control and monitoring of cleaning apparatus and devices.