HI 8043 is a versatile D.O. meter ideal for use in school 
laboratories.
A common 9 Volt battery supplies the unit with up to
 100 hours of continuous power, making it truly portable.
There is
 also a low battery warning that helps eliminate the possibility of 
taking an erroneous reading due to low power.
The simplicity of 
this meter is its greatest asset. Select the O2 mode and the 
polarigraphic probe will supply you with accurate dissolved oxygen 
measurements in mg/L. Switch the dial to °C to display the temperature 
readings.
The STB mode is particularly useful to keep the current 
flowing through the probe which is continuously polarized and ready for 
use.
   
   HI 8043 is supplied with HI 76401 D.O. probe with 3m (10') cable, 
calibration screwdriver, 2 spare membranes, HI 7041S (30mL), battery and
 instructions.