GREENTEST 1GREENTEST 1 is the original portable digital nitrate detector for fruit and vegetables.With just one click GREENTEST 1 can tell you the nitrate level of your fruit, vegetables and whether it is safe to eat.Technical specificationsNitrate measurement range: 0 9999 mg/kg;Measurement time: 3 sec;Measurement margin of error: < 10%;Power source: Li-Ion battery;Battery capacity: 720 mh;Additional power source USB;USB charge current: 310 mA;Power voltage range : 5V;Usage time up to 20 hours**;Dimensions: 122 52 14 mm;Weight 85g.TFT color display resolution: 320 240;Operating temperature: 0 +60 .NOTE:*Increasing the number of observations leads to a greater accuracy of results.**Usage time specified for default device settings and battery capacity of 720 mAh.