UIUZMAR Digitale pH Meter pH TDS EC Meter voor Hydrocultuur Voedingsoplossing pH en EC Meter met LCD Display TDS Water Tester pH PPM Meter voor DWC Setup Aeroponic Groeiende Tent Indoor Plant Groeien

Prodotto ottimo e facile da usare, Completato dalle batterie è il kit per la calibrazione.

Für den preis ein hervorragendes gerät. Macht was es soll. Leicht zu bedienen. Gute ablesbar. Für einen guten Grow geeignet.

Bastante preciso , varía muy poco en cda muestra pero más o menos mide en el sitio, buen medidor en comparación con otros del mismo tipo

Très mauvais testeur , pas précis , la fonction thermomètre marche bien ,Les autres fonctions nul

I'll keep it short, (yeah right)! but as far as these pens go I am a hardcore stickler when it comes to these pens and use several different types and brands that I have meticulously calibrated. When I ph my water I use two or three different pens and compare them for consistency and accuracy. After passing my rigorous calibration process I make my decision to keep or return it if it doesn't work perfectly. This pen has a large backlit display and is accurate to .01. Pens accurate to .1 are worthless because of the broad range in the reading. You can't determine it's accuracy. I first dipped this pen in a ph solution of 7.00 and it read 6.89. Not bad for right out of the box. I then calibrated using my very meticulous 3 part solution process of 7.00, 4.00, and 10.01. The pen now reads the solutions to a T. Calibration successful. I use this with other pen when checking p.h. and this pen reads within .01 which is almost perfect. So if said other pen reads 6.27, this pen will read 6.26 to 6.28 which is as close as your ever going to get! I've lost several plants due to stunting and nutrient deficiency because my ph was way off. I can't stress enough how important this is to the health of your plants. I have four other $25-$30 pens and this is my favorite along with one other that is similar. Make sure it has a large backlit display, and is accurate to .01 or in my opinion is a waste of time and money. Use a 3 part solution for calibration. Some pens use different values. All my pens calibrate to 7,4, and 10.01. I only buy ones with these values. Try to use solution not the powder you mix with water, if you can. Keep the pen cap in electrode storage solution even if your pen doesn't have any included. Just cut a small piece of sponge and put it in the bottom of the cap and wet it with solution. You can used distilled water if you don't have any. Buy a 12 dollar calibration solution kit with storage solution. Practice calibrating Al least every two weeks to keep your instruments in check.