TDS1 Water Quality Test Pen

TDS1 is a digital water quality test pen for measuring total dissolved solids (TDS) in drinking water. Use it to compare tap water and filtered water, including before and after reverse osmosis filtration.

The test pen is available separately and is included free with Nova 100 orders where that offer is available.

Key benefits:
• Measures TDS levels in drinking water
• Helps compare tap water and filtered water
• Useful before and after reverse osmosis filtration
• Simple digital reading for at-home water quality awareness

TDS1 for a quick water reading.

Check dissolved-solids readings at home and compare tap water with filtered water. TDS readings do not assess whether water is safe to drink or identify every contaminant.

£0.99

TDS (Total Dissolved Solids), which indicates the dissolved solids in 1 liter of water, measured in milligrams per liter (mg/L) or ppm.

TDS includes non-volatile soluble salts, organic matter, and insoluble particles that can pass through filters.
0-50 High Purity
51-100 Pure water
101-150 General Purity
151-200 Light Scaled water
201-300 Scale Formation
301-600 Severe Scale formation
601-1000 Poor taste
1000+ Unsuitable for drinking

Measurement Range: 0-9990 PPM
Battery Specification: 3V Button Battery
Operating Current: ≤2mA
Battery Capacity: 50mAh
Product Dimensions: 150×17×10.8mm
Product Weight: 32g
Operating Environment: 0℃~60℃

TDS Detection Pen Usage Instructions
Remove the pen cap, press the power button, and fill a water cup 2/3 full with the water to be tested.
Place the pen into the water to be tested and gently stir.
Wait for the reading to stabilize, then observe the measurement on the display screen.
After use, shake off or wipe dry the water from the pen tip, replace the pen cap, and turn off the power.
Remove the battery compartment.

TDS Tester Pen x1
Manual x1

Compare your options

Nova 100 vs other everyday water choices

Most buyers are comparing a countertop RO system with a filter jug, an under-sink RO system, or bottled water. This table helps clarify setup, renter fit, daily routine, and ongoing cost.

Comparison of Nova 100, filter jugs, under-sink reverse osmosis systems, and bottled water for everyday home drinking water.
What matters	Nova 100 Best fit	Filter jug	Under-sink RO	Bottled water
Installation	No plumbing, no drilling, plug-and-go countertop setup.	No installation needed.	Usually needs plumbing, drilling or professional fitting.	No installation needed.
Renter friendly	Designed for flats, renters and kitchens where permanent changes are not preferred.	Renter friendly, but more basic as a daily water system.	Less suitable for rented homes or short-term living.	Renter friendly, but creates an ongoing buying routine.
Filtration format	Countertop reverse osmosis system for everyday drinking water.	Basic jug filtration, depending on cartridge type.	Reverse osmosis, but tied to the sink installation.	Varies by brand and source; less transparent at home.
Space and routine	Sits on the counter and fits daily glass, bottle and cooking water moments.	Takes fridge or counter space and needs refilling often.	Uses under-sink cupboard space and fixed plumbing.	Uses storage space and creates plastic bottle clutter.
Ongoing cost	Replace the ROF2501 filter when needed; no constant bottled-water run.	Lower entry cost, ongoing cartridge replacements.	Higher installation commitment plus filter maintenance.	Low upfront cost, but continuous purchase and delivery/carrying cost.
Best for	Small kitchens, flats, renters, offices, and everyday home drinking water.	Budget entry-level filtration.	Owned homes with permanent kitchen setup.	Temporary backup or occasional use.