I have purchased 2 of these, why are they so inaccurate?

If you calibrate ANY PH meter using the mix it yourself "calibration" solutions, accuracy will be impossible. I just purchased this meter set, and discovered the distilled water I use was ph4 and below! I have the "other" style cheap meter, that has proven very stable for me, and after checking it in GHP 7.0 calibration solution, used it to test the accuracy of this relentlessly poor example of a ph testing system. First off, the solution instructions make no mention what the ph of the distilled water needs to be. My 4.0 water mixed with the 4.0 and 6.86 powder, resulted in a solution of 3.3 and 6.0 instead, so IMO, the MIY calibration solutions are a joke, as are ph meters that calibrate on the 6.86 standard instead of 7.0.

If i use a 7.0 calibration solution will the automatic calibration be off by .14 since it comes with a 6.86 calibratind powder?

Yes! I recently calibrated with 7.0. Prior to calibration, it read the 7.0 solution at 7.0, calibrated with 7.0 solution it now reads 7.18. Find the correct calibration solution

If my tap water is between 6.5 and 7.0 ph do i need to add the ph up and down liquid i bought for indoor cannabis grow? What about ppm?

If you’re growing in soil 6.5 is perfect if you’re growing in Hydro/water do you want to be around 5.8 say you’re at 7.0 PH I would just add a couple drops per gallonTo get it down two around 6.5

If I choose EC, does it retain the setting after power cycles?

Yes, but my meter randomly switched back to TDS. The "EC" does not show a decimal, and the numbers are too close to TDS. If you don't pay attention, you will hurt your plants. Do not purchase.

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

Help Track order

Account Cart

VIVOSUN pH and TDS Meter Combo, 0.01ph High Accuracy Pen Type pH Meter ± 2% Readout Accuracy 3-in-1 TDS EC Temperature Meter for Hydroponics, Household Drinking, and Aquarium, UL Certified

Product ID: 255798533

Details

Brand
VIVOSUN
Manufacturer
VIVOSUN
Recommended uses for product
Aquarium Pool
Unit count
2 Count
pH range
0-14

💧0-9990 ppm TDS range

📏0.01 pH precision

🌡️0.1-80°C temp accuracy

€ 44.37

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Spain.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

💧 Stay ahead of the curve with precision water insights!

PORTABLE PROTECTED - Lightweight design with a durable protective case for on-the-go testing
PRECISION P H READINGS - Ultra-fine 0.01 pH resolution for lab-grade accuracy
VERSATILE APPLICATION - Perfect for hydroponics, aquariums, pools, and household drinking water
RAPID RELIABLE RESULTS - Instant readings with ±2% accuracy to keep your water quality in check
COMPREHENSIVE 3 IN 1 TESTING - TDS, EC, and temperature all in one sleek handheld device

The VIVOSUN pH and TDS Meter Combo delivers professional-grade water quality testing with ultra-precise 0.01 pH resolution, a broad 0-9990 ppm TDS range, and accurate temperature measurement from 0.1 to 80°C. Designed for hydroponics, aquariums, pools, and household use, this lightweight, handheld 3-in-1 meter offers rapid, reliable readings with ±2% accuracy, all protected in a convenient carrying case. UL certified and trusted by over 23,000 users, it’s your essential tool for maintaining optimal water conditions.

Specifications

ASIN	B06XKMH86J
ASIN	B06XKMH86J
Batteries	1 CR2032 batteries required.
Brand Name	VIVOSUN
Customer Reviews	4.1 4.1 out of 5 stars (23,233)
Customer reviews	4.1 4.1 out of 5 stars (23,233)
Date First Available	11 December 2017
Is Discontinued By Manufacturer	No
Item Weight	0.1 Kilograms
Item model number	4336465266
Manufacturer	VIVOSUN
Manufacturer	VIVOSUN
Material Type	Plastic
Model Number	4336465266
Number of Items	2
Package Dimensions	17.7 x 9.9 x 3.2 cm; 100 g
Part Number	4336465266
Recommended Uses For Product	Aquarium, Swimming Pool, Household Drinking Water
Sterility Rating	0-14
UPC	615435160962
Unit Count	2 Count

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Reema J.

Perfect platform for hard-to-find items. Delivery was prompt.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.