What is Reddit's opinion of
VIVOSUN 4-in-1 Digital pH Meter with pH/TDS/EC/Temp Function, 0-14.0 pH Measurement Range, ±0.1 pH Accuracy Water Quality Tester for Hydroponics, Household Drinking, and Aquarium?
From 3.5 billion Reddit comments
1 review of this product found across Reddit:
1 point
·
26th Jul 2020
PPM is parts per million - it's a measurement of concentration, so it's dependent on the volume of your reservoir. If you use the same X grams of nutrients, the PPM will be much higher in a 5 gallon bucket than a 15 gallon tote. There's also a question of how easily your dry fertilizer will dissolve, what else might be in your water before you start, etc. It's really worth investing in an EC meter, otherwise, you're just blindly guessing.
​
https://www.amazon.com/gp/product/B08227NGWJ/ref=ppx_yo_dt_b_asin_title_o00_s01?ie=UTF8&psc=1
​
As for the dry fertilizer, you really should research the specific product to see how effective/appropriate it is for hydroponics.
Popular alternatives to VIVOSUN 4-in-1 Digital pH M...
APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy
< $50
Apera Instruments AI311 Premium Series PH60 Waterproof pH Pocket Tester Kit, Replaceable Probe, ±0.01 pH Accuracy
$50 - $100
Bluelab PENPH pH Pen, Digital Meter for Water with Easy Two Point Calibration and Double Junction Probe Test Kit for Hydroponic System and Indoor Plant Grow, White
$50 - $100