For mfr: what is the accuracy, in +/-ppm, not % of scale?

I'm not the manufacturer, just a buyer/owner of one these. I can tell you what the User's Guide says about the meter's accuracy. Quote: Resolution: EC 0 - 00:0.1 μS / 0.01mS; 100 -999 1μS / 0.10mS; 1000 - 9990; 10 μS / 1.00mS TDS: 0 -99: 0.1 ppm / 0.01ppt; 100-999: 1 ppm / 0.10ppt; 1000-9990: 10 ppm /1.00 ppt Temperature: 0.1 ˚C/F Hope that helps somewhat. Accuracy: +/- 2%

Can i get the model that takes aaa batteries?

Yes, this one takes AAA batteries.

You can replace it but should not need to, it last for a very long time. more than a year.

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HM Waterproof EC/TDS/Temp Combo Meter

Product ID: 5583978

Details

Brand
HM Digital
Special Feature
Waterproof
Color
White/Purple
Age Range (Description)
Adult
Included Components
Battery Meter
Outer Material
Plastic

⚡0-9990 µS EC range

💧IP67 Waterproof housing

🌡️0-80°C temperature range

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Description

💧 Stay sharp, stay dry, stay ahead with the ultimate water quality pro meter!

FAST RESPONSIVE - 0.5-second response time means you get instant, actionable data to stay ahead in your projects.
RUGGED WATERPROOF BUILD - IP67-rated housing ensures reliable performance even in wet, demanding environments—never miss a measurement.
TRIPLE PARAMETER MASTERY - Simultaneously measures Electrical Conductivity, Total Dissolved Solids, and Temperature for comprehensive water quality insights.
PRECISION MEETS PORTABILITY - Compact 7.3'' handheld design fits your on-the-go lifestyle without sacrificing accuracy.
USER FRIENDLY DIGITAL CALIBRATION - Push-button digital calibration with detachable platinum electrodes guarantees professional-grade precision every time.

The HM Waterproof EC/TDS/Temp Combo Meter is a professional-grade, handheld device designed for precise measurement of electrical conductivity (0-9990 µS), total dissolved solids (0-8560 ppm), and temperature (0-80°C). Featuring an IP67 waterproof housing, digital push-button calibration, and detachable platinum electrodes, it delivers fast 0.5-second readings with ±2% accuracy. Compact and durable, it’s engineered for demanding indoor and outdoor water quality testing.

Specifications

Brand	HM Digital
Special Feature	Waterproof
Color	White/Purple
Age Range (Description)	Adult
Included Components	Battery, Handheld Meter, Wrist Strap
Outer Material	Plastic
Display Type	Digital
Product Care Instructions	Wipe Clean
Unit Count	1.0 Count
Power Source	Battery Powered
Model Name	COM-100 WATERPROOF PROFESSIONAL SERIES
Number of Batteries	2 AAA batteries required.
Item Length	7.3 Inches
Upper Temperature Rating	80 Degrees Celsius
Response Time	0.5 seconds
Reusability	Reusable
Immersion Depth	1 Meters
Style	Professional
Indoor/Outdoor Usage	Indoor
UPC	095225177507 891144000007
Manufacturer	HM Digital
Part Number	COM-100
Item Weight	3.53 ounces
Item model number	COM-100
Batteries	2 AAA batteries required.
Is Discontinued By Manufacturer	No
Size	7 Inch
Voltage	3 Volts
Item Package Quantity	1
Special Features	Waterproof
Batteries Included?	No
Batteries Required?	No
Battery Cell Type	Lithium
Warranty Description	1 YEAR WARRANTY
National Stock Number	4910-01-620-0848

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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.

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NZ$143

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In stock

Sold byAmazon New ZealandDelivered 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 New Zealand.

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