According to Hanna Instruments , the HI 935002 and HI 935009 are waterproof 2-channel thermometers offering a wide temperature range and an extraordinary 1600 hours of battery life ideal for extended lab and field use
A dual-level LCD shows the current temperature and the high and low values of each channel. The difference between each channel can also be shown along with the current temperature at each probe or the high and low values of the difference. A relative value can be set on each channel and variances around that value can then be monitored. These instruments enable you to see all continuously updating information on either channel. A HOLD button gives the user time to record the reading and HI 935009 will store that reading for later retrieval. Both instruments read in °C and °F and if required, HI 935009 features a user calibration feature. Remaining battery power is displayed at start-up and is managed with a low battery warning signal and error prevention (BEPS). HI 935009 has a selectable auto-off interval and a button activated backlight for low light conditions.
HI 935002 is supplied complete with batteries, protective case and instructions. HI 935009 is supplied complete with batteries, protective case and instructions.