We are offering digital do meter - 831.
specifications
do : 0-19.9 ppm
resolution: 0.1 ppm
sensor: amperometric do probe (gold, silver membrane type)
temp. Comp. : 5 - 55 0c
accuracy : +-2% f5
display : 3/1/2 digit lcd
battery : 9v dc (eveready 216 or equivalent)
size: 180 x 85 x 30 mm
weight: 250 gm. (approx)