SSt Sensing Limited Honeywell LLE STD Series Liquid Level Switch Level Switch, Transistor Output, Threaded Mount,

Solid state technology
Compact
Digital output
Pre-wired
Electrically robust
No moving arts to cause unreliability
Can be installed in applications where space is limited
Microprocessor compatible
Can detect tiny amounts of liquids when positioned correctly
Accurate, repeatable switching point
Easy to install, saving assembly time
Reverse polarity, over voltage, short circuit and transient protection
Low in cost for price sensitive applications