Gro’Chek EC (HI983302N)
Ideally suited for horticultural and hydroponics applications, the HANNA EC Meter (with 0.01 mS/cm resolution) features housing and cable connections that are sealed against vapor and humidity. In addition, false readings due to low batteries as well as frequent battery changes are NOT an issue with the HI 983302N as it includes a 12-volt power supply.
Instruction Manual (PDF)
The HI 983302N ships complete with a low-maintenance probe (0.00 to 9.99 mS/cm), 12-volt adapter, 1413 mS/cm calibration solution (20 mL), a calibration screwdriver and complete instructions. Warranty: 2-years (six months on electrode).