Enviro-Systems Model SE-105S (SDI-12 Out) Smart Shaft Encoder. These came from a working enviroment. Guaranteed! We have up to six of these for sale! SALE SALE $89 Here are some specs from the internet!... May or May not apply!!! Description The Enviro-Systems Model SE-105S Smart Shaft Encoder is a low power, computerized shaft encoder designed for field, battery operation for the measurement of water level and rain level through the modification of a weighing type rain gage. The internal CMOS computer allows the encoder to emulate an absolute encoder with SDI12 interfaces. The user may set the starting point, read the value through the interface, and program several parameters. Features 10 to 16V operation Internal battery backup using nicad battery Low power requirements 32mW standby Optical encoder for low torque requirements Low stiction -40 C to 60C operation All options are user programmable via the SDI-12 interface and saved in an on-board EEPROM. Dual bearings for added shaft support Optional LED display Optional 4 BCD digit parallel output Optional isolated 4-20mA output Optional metric scaling