QiWei Pen-Type pH Meter Series (PH-20, PH-20B, PH-20BW, PH-220, PH-220B, PH-220BW) Malaysia: In-Depth Engineering Application Analysis & Technical Specifications

In municipal tap water source monitoring, aquaculture, environmental discharge compliance checks, textile printing and dyeing, electroplating rinses, beverage manufacturing, and scientific research laboratories across Malaysia, rapid and accurate determination of water acidity/alkalinity (pH) is vital for water safety and process stability. As a premier precision analytical instrument and safety solution provider rooted in Puchong, Selangor,MTM Precision Sdn. Bhd. supplies the comprehensive QiWei Pen-Type pH Meter Series (covering PH-20, PH-20B, PH-20BW, PH-220, PH-220B, and PH-220BW models)—engineered for rapid field spot-checking,high-precision laboratory analysis, and versatile outdoor or plant-floor operations.

This article provides an in-depth engineering application analysis of the QiWei pen-type pH meter series,covering 0.1 pH standard vs. 0.01 pH high-precision tiers, 25°C three-point calibration, backlit displays and external electrode flexibility (B and BW series), and rugged field durability.

1. Model Differentiation: 0.1 pH Standard Grade vs. 0.01 pH Laboratory Grade

The QiWei pen-type pH meter series is structured into precise performance tiers to match specific industry accuracy requirements:

PH-20 Series (Standard 0.1 pH Grade):
- Covers a measuring range of 0.1 ~ 14.0 pH with a resolution of 0.1 pH (temperature resolution 0.1°C / 0.1°F) and a basic measurement error of ±0.1 pH. Ideal for routine water quality screening,aquaculture daily inspections, and general industrial wastewater pre-screening.
PH-220 Series (High-Precision Laboratory 0.01 pH Grade):
- Covers a measuring range of 0.01 ~ 14.00 pH providing high resolution (0.01 pH) and ultra-tight ±0.01 pH measurement accuracy. Designed specifically for pharmaceutical purified water, precision electroplating baths, scientific research, and strict environmental discharge compliance.

2. 25°C Three-Point Calibration & 0 ~ 50°C Thermal Adaptability

To ensure long-term stability in tropical climates and eliminate electrode aging drift:

Standard Three-Point Alignment Calibration: All models support standard three-point calibration at 25°C (using 4.0 / 6.9 / 9.2 pH buffer solutions), ensuring full-range linear accuracy across acidic,neutral, and alkaline test regimes.
Wide Operating Temperature: Rated for working temperatures from 0 ~ 50°C (32 ~ 122°F), perfectly suited for Malaysia's warm, humid outdoor industrial sites and indoor laboratories.

3. Feature Upgrades: Backlit Displays and Internal/External Electrode Options (B & BW Series)

To accommodate varying ambient lighting and deep-vessel testing requirements, QiWei offers specialized suffix configurations:

Base Models (PH-20 / PH-220): Utilize a direct-plug internal electrode design without backlighting,suitable for well-lit routine testing environments.
Backlit Models (PH-20B / PH-220B): Add clear LCD backlighting (have) for easy data reading during night shifts, dark industrial plants, or confined underground pipe inspections.
External Electrode Backlit Models (PH-20BW / PH-220BW): Equipped with an external electrode on a flexible cable and backlighting. The cabled probe allows technicians to reach deep into narrow reagent bottles, deep industrial pipes, or stirred reaction vessels while viewing the meter display comfortably at eye level.

4. Official Technical Specifications & Performance Matrix

Technical Parameter	PH-20	PH-20B	PH-20BW	PH-220	PH-220B	PH-220BW
Range of Measurements	0.1 ~ 14.0 pH	0.1 ~ 14.0 pH	0.1 ~ 14.0 pH	0.01 ~ 14.00 pH	0.01 ~ 14.00 pH	0.01 ~ 14.00 pH
Resolution	pH: 0.1 pH Temp: 0.1°C / °F	pH: 0.1 pH Temp: 0.1°C / °F	pH: 0.1 pH Temp: 0.1°C / °F	pH: 0.01 pH Temp: 0.1°C / °F	pH: 0.01 pH Temp: 0.1°C / °F	pH: 0.01 pH Temp: 0.1°C / °F
Temperature Range	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)
Accuracy	pH: ±0.1 pH Temp: 1°C / 2°F	pH: ±0.1 pH Temp: 1°C / 2°F	pH: ±0.1 pH Temp: 1°C / 2°F	pH: ±0.01 pH Temp: 1°C / 2°F	pH: ±0.01 pH Temp: 1°C / 2°F	pH: ±0.01 pH Temp: 1°C / 2°F
pH Calibration	25°C Three-point alignment (4.0 / 6.9 / 9.2)	25°C Three-point alignment (4.0 / 6.9 / 9.2)	25°C Three-point alignment (4.0 / 6.9 / 9.2)	25°C Three-point alignment (4.0 / 6.9 / 9.2)	25°C Three-point alignment (4.0 / 6.9 / 9.2)	25°C Three-point alignment (4.0 / 6.9 / 9.2)
Backlight	Not have	Have	Have	Not have	Have	Have
Electrode Type	Internal electrode	Internal electrode	External electrode	Internal electrode	Internal electrode	External electrode
Operating Temperature	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)	0 ~ 50°C (32 ~ 122°F)
Power Supply	1.5V battery × 4 pcs	1.5V battery × 4 pcs	1.5V battery × 4 pcs	1.5V battery × 4 pcs	1.5V battery × 4 pcs	1.5V battery × 4 pcs

5. Localized Professional Support: MTM Precision's Commitment

Equipping your water testing teams and plant quality control staff with the right pen-type pH meter ensures high inspection efficiency and reliable data integrity across all operating sites. As an authorized partner in Malaysia, MTM Precision Sdn. Bhd. provides full product consultation, calibration buffer powders, and technical support from our Puchong showroom and service center, backed by:

Water Quality & Instrument Consulting: Expert guidance to match standard PH-20 models or high-precision backlit external-electrode PH-220BW units to your specific industrial compliance requirements.
Local Service & Technical Support: Dedicated after-sales assistance, electrode maintenance guidance,and spare parts supply right here in Selangor.