What kind of battery does it have?

1 x 3V button battery CR2032 , it's included in the water tester. Sincerely hope you enjoy the products we sell on Amazon!

how can i test if the unit is accurate could i use distilled which i assume should be zero, thanks tom

Thanks for your question. This TDS meter is pre-calibrated in factory, no need calibrate again by customer, we do this to prevent as many calibration related mistakes as possible, and it's easier to use. To maintain the accuracy, it's better to rinse the probe with distilled water after each use. For your mentioned distilled water, it should read 0 ppm theoretically, but in actual application, if you can't keep test condition very clean, it may read 0-2ppm usually.

Can this also check for ph ?

It Does not. It measure TDS , EC and Temperature 3 in 1. PH Meter is another tester.

Has anyone else experienced this reading into the hundreds on very low ppm water after a couple weeks of use? solutions?

Are you rinsing the probe with distilled water after each use and patting it dry, if not, dried solids will build up on the probe and render the measurements inaccurate.

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HoneForest TDS Meter, Digital Water Tester - Accurate and Reliable, Measures TDS, EC & Temperature (°F/°C), 0-9990ppm, Water Test Meter for Drinking Water, RO/DI System, Aquariums, etc

Product ID: 44553954

💡Backlit LCD with auto-lock display

📊3-in-1 TDS, EC & Temp measurement

⚙️Titanium alloy probe for precision

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MOP$211

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Sold byAmazon MacauDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

💧 Stay ahead of water quality—because your health deserves precision!

SMART AUTO OFF - Energy-saving auto shut-off after 2 minutes of inactivity keeps your meter ready when you need it.
EFFORTLESS READINGS - Large backlit LCD with auto-lock function delivers instant, easy-to-read results—even in low light.
PRECISION YOU CAN TRUST - Premium titanium alloy probe ensures lab-grade accuracy for every water test.
TRIPLE CHECK YOUR WATER - Simultaneously measures TDS, electrical conductivity, and temperature for comprehensive water quality insights.
VERSATILE WATER TESTING - Perfect for drinking water, RO/DI systems, aquariums, hydroponics, pools, and spas—know your water’s health anytime.

The HoneForest TDS Meter is a compact, battery-powered digital water tester featuring a premium titanium alloy probe and intelligent chip for highly accurate measurements. It offers 3-in-1 functionality measuring Total Dissolved Solids (TDS), Electrical Conductivity (EC), and temperature (°F/°C) with a wide range up to 9990 ppm. Equipped with a large backlit LCD and auto-lock display, it provides quick, reliable readings for drinking water, RO/DI systems, aquariums, hydroponics, pools, and spas. Lightweight and portable, it includes a leather carrying case and offers smart auto shut-off for convenience and energy efficiency.

Specifications

ASIN	B073713G5F
Batteries Included?	No
Batteries Required?	No
Best Sellers Rank	#6,801 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #206 in Pool Chemicals & Water Testing Products
Color	White
Customer Reviews	4.5 4.5 out of 5 stars (16,392)
Date First Available	May 31, 2017
Display Style	LCD
Included Components	1 x TDS Meter, 1 x Instruction, 1 x portable leather bag, 1x color box
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Item Weight	1.62 ounces
Item model number	HFTDS-M7
Manufacturer	HoneForest
Material	Plastic
Part Number	HFTDS-M7
Power Source	Battery Powered
Product Dimensions	6.29 x 1.14 x 0.59 inches
Size	6.29 x 1.14 x 0.59 inches (160x29x15mm)

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