>I remember someone (Maybe George) talking about a temperature sensing IC, >but it was not mentioned how it was put under water. There are are two ICs available, an LM34 and an LM35. One has an output voltage corresponding to centigrade, the other fahrenheit (I forget which is which). They are packaged in an epoxy, three pin, transistor style package. After connecting the wires, seal the leads and stick it in water. George