video review: https://youtu.be/ZNxrCv33jjs
 Model : PM-790 pro
 Manufacturer: KETT- Japan
 Kett PM-790 Coffee and Agricultural Product Moisture Meter is the latest product in the line of Agricultural Product Moisture Meters of KETT Japan and replaces PM-650, an indispensable product in the grain, seed and coffee industries. PM-790 pro moisture meter is widely used worldwide, it can measure 99 types of grains such as coffee, tea, wheat, corn ... for fast and accurate results.
 * Technical specifications of Kett PM-790 pro agricultural moisture meter :
 + Measuring range: 1- 40% (depending on model)
 + Division: 0.1%
 + Accuracy: +/- 0.5% (< 20%)
 - Measuring principle: Dielectric constant
 - Measuring object: Measures 99 types of grains and seeds
 - Display: LCD screen with bright background
 - Sample volume: 240 mL
 - Communication: RS232, printer
 - Operating environment: 0 - 40oC, < 85% RH
 - Function: Adjust average humidity, automatic off mode
 - Dimensions: 125(W)x215(H)x205(D)
 - Weight: 1.3/2.2 kg
 - Power supply: 1.5V AA battery x 4
 - Power consumption: 240mW