Comes calibrated - holds calibration for a full year! You don't have to baby this meter just don't drop it in a bucket of water - it is NOT waterproof.
The HI98331 Soil Test™ is a pocket tester specifically designed to directly measure soil conductivity (EC) and temperature. With a compact size, single button operation, and automatic calibration, Soil Test is an excellent choice for taking direct conductivity measurements in soil, coco, and rockwool.
No need for soil slurries with the steel penetration electrode.
Integrated temperature sensor for automatic temperature compensation.