德記儀器精選 17 款筆型電導度/TDS 計，含經濟型、IP67 防水型、四參數進階款（DEC1+），具 APP 雙控、自動鎖定、可更換電極，適用游泳池、水族館、食品加工及實驗室現場檢測，品牌涵蓋 DLAB、EZDO、HANNA 等 4 個品牌。
HANNA Instruments EC/TDS測試筆 - 低範圍 HI98311
DiST® 5 EC/TDS/Temperature Tester (0-3999 µS/cm) - HI98311
HANNA Instruments EC/TDS測試筆 - 高範圍 HI98312
DiST® 6 EC/TDS/Temperature Tester (0.00 to 20.00 mS/cm) - HI98312
HANNA Instruments 純水EC測試筆 HI98308
Pure Water Tester (0.0 - 99.9 µS/cm) - HI98308
HANNA Instruments EC測試筆 - 低範圍 HI98303
DiST 3 Waterproof Low-Range EC Tester - HI98303
HANNA Instruments EC測試筆 - 高範圍 HI98304
DiST 4 Waterproof EC Tester (0.00-20.00 mS/cm) - HI98304
HANNA Instruments TDS測試筆 - 低範圍 HI98301
DiST 1 Waterproof TDS Tester (0-2000 ppm) - HI98301
HANNA Instruments TDS測試筆 - 高範圍 HI98302
DiST 2 Waterproof High-Range TDS Tester - HI98302
HANNA Instruments 海水鹽度測試筆 HI98319
Marine Salinity Waterproof Tester - HI98319
HANNA Instruments GroLine 土壤EC測試筆 HI98331
Soil Test™ Direct Soil EC Tester - HI98331
