Hanna HI50021P Calibration Check Solution for HI9813-6 (25 x 20 mL Sachets) aquarium dosing The TDS-4TMA handheld meter is

The TDS-4TMA handheld meter is ideal for testing TDS and salt levels of freshwater aquariums and ponds

00 mg/L (ppm) — no measuring

Electrical noise from motors

Aquaponics systems

Hanna HI50021P Calibration Check Solution for HI9813-6 (25 x 20 mL Sachets) aquarium dosing The TDS-4TMA handheld meter isHI50021P is a premium quality calibration check solution used exclusively for the HI9813 6 portable pH EC TDS Temp. meter. Each sachet has the lot number and expiration date stamped on it and is made of light block foil ensuring freshness each time one is opened. Hanna's line of solutions have been specially formulated to have an expiration of 5 years from the date of manufacture for an unopened sachet. The HI50021P is for 25 sachets containing 20 mL