 - Graphtec GL100-N-4VT Data Logger with Voltage Temperature Input Module- Manufacturer: Graphtec
 - Data logger with GS-4VT Voltage/Temp. input module, 4.9MB on-board memory, micro-SD memory slot, micro-B USB PC interface, LCD display Hayward, CA

Data logger with GS-4VT Voltage/Temp. input module, 4.9MB on-board memory, micro-SD memory slot, micro-B USB PC interface, LCD display