# Hanna Instruments HI98107 pHep pH Tester vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics: specs and price compared

A sourced, side-by-side comparison of the Hanna Instruments HI98107 pHep pH Tester (Hanna Instruments) and VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics (VIVOSUN) among ph meters. VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics is the cheaper of the two at $8.55.

## Side by side

| Spec | Hanna Instruments HI98107 pHep pH Tester | VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics |
| --- | --- | --- |
| US price | $64.99 | $8.55 |
| Brand | Hanna Instruments | VIVOSUN |
| Ph range | 0.0 to 14.0 pH | 0.00 to 14.00 |
| Resolution ph | 0.1 pH | 0.01 pH |
| Accuracy ph | ±0.1 pH at 25°C/77°F (Hanna's own spec table separately lists ±0.2 pH; the narrative accuracy claim ±0.1 pH is used here) | ±0.01 pH |
| Calibration points | Automatic, 1 or 2-point, using standard buffers 4.01/7.01/10.01 | 3-point (calibration buffer powders included) |
| Atc | Automatic, 0 to 50°C | Yes |
| Electrode type | Cloth-junction pH electrode (larger surface area than a standard ceramic junction) | — |
| Waterproof rating | Waterproof; rated to RH 100% max, 0 to 50°C | — |
| Battery type | 1 x CR2032 3V lithium, approx. 1000 hours continuous use | 2 x 1.5V button cell (built-in) |

## Key differences

- Ph range: Hanna Instruments HI98107 pHep pH Tester 0.0 to 14.0 pH vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 0.00 to 14.00
- Resolution ph: Hanna Instruments HI98107 pHep pH Tester 0.1 pH vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 0.01 pH
- Accuracy ph: Hanna Instruments HI98107 pHep pH Tester ±0.1 pH at 25°C/77°F (Hanna's own spec table separately lists ±0.2 pH; the narrative accuracy claim ±0.1 pH is used here) vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics ±0.01 pH
- Calibration points: Hanna Instruments HI98107 pHep pH Tester Automatic, 1 or 2-point, using standard buffers 4.01/7.01/10.01 vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 3-point (calibration buffer powders included)
- Atc: Hanna Instruments HI98107 pHep pH Tester Automatic, 0 to 50°C vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics Yes
- Battery type: Hanna Instruments HI98107 pHep pH Tester 1 x CR2032 3V lithium, approx. 1000 hours continuous use vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics 2 x 1.5V button cell (built-in)

## Sources

- Hanna Instruments HI98107 pHep pH Tester: https://www.hannainst.com/hi98107-phep-ph-tester.html (hannainst.com, verified 2026-08-12)
- VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics: https://www.amazon.com/VIVOSUN-Meter-Digital-Tester-Water/dp/B01M5IASHD/ (amazon.com, verified 2026-08-12)

Canonical: https://frontdeskreview.com/gear/ph-meters/hanna-hi98107-vs-vivosun-ph-meter/
Cite: Per The Front Desk Review, Hanna Instruments HI98107 pHep pH Tester ($64.99) vs VIVOSUN Digital pH Meter Pen Tester for Water & Hydroponics ($8.55) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/ph-meters/hanna-hi98107-vs-vivosun-ph-meter/
License: CC BY 4.0.