Best Optical Comparators

Luster Leaf 1601 Rapitest Test Kit for Soil pH Nitrogen Phosphorous and Potash 1 Pack

Quick, at home results for Soil pH, Nitrogen, Phosphrous and Potash.
Innovative and inexpensive soil test kit features an easy-to-use capsule system and patented color comparators.
Contains all components needed for 40 tests. 10 for each of pH, N, P and K.
Simple, detailed instructions included. Great for beginners and experienced gardeners alike..
Soil pH preference list for over 450 plants included.

Precision Measurements: Features a 2.25" diameter dial indicator with 0.001" graduations, a revolution counter equal to 0.1" per revolution and....
Accurate Readings: Dial Indicator has microfine graduations for 0-100 continuous readings and is designed to measure variations up to 0.001".
Base Dimensions: The magnetic base features an on/off switch for easy magnet release and is 2" in height by 2-11/32" in width and 1-13/16" in depth.
Set Includes: 1" dial indicator, magnetic base with fine adjustment, and fitted storage case.
Used on lathes, surface plates, milling machines, comparators and various other machining applications.

The LM2903P devices consist of two independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages.
Single-supply or dual supplies Wide range of supply voltage Maximum rating: 2 V to 36 V.
Low supply-current independent of supply voltage: 200 µA per comparator, Output compatible with TTL, MOS, and CMOS.
Common-mode input voltage range Includes Ground, Low output saturation voltage.
Differential input voltage range equal to maximum-rated supply voltage: ±36 V.

Precision Measurements: Features a 2-1/4" diameter dial indicator with 0.001" graduations, a revolution counter, and tolerance markers to observe tolerance limits.
Accurate Readings: Dial indicator has microfine graduations for 0-100 continuous readings.
magnetic base also has a V-base for mounting on cylindrical surfaces.
Magnetic Base: The magnetic base features an on/off switch for an easy magnet release.
Set Includes: 2-1/4" dial indicator, flex arm magnetic base, and fitted storage case.
Used on lathes, surface plates, milling machines, comparators and various other machining applications.

The LM2903P devices consist of two independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages.
Single-supply or dual supplies Wide range of supply voltage Maximum rating: 2 V to 36 V.
Low supply-current independent of supply voltage: 200 µA per comparator, Output compatible with TTL, MOS, and CMOS.
Common-mode input voltage range Includes Ground, Low output saturation voltage.
Differential input voltage range equal to maximum-rated supply voltage: ±36 V.

Four independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages.
Wide Supply Ranges Single Supply: 2 V to 36 V, Dual Supplies: ±1 V to ±18 V, Differential Input Voltage Range Equal to Maximum-Rated Supply Voltage: ±36 V, Low Input Offset Current: 3 nA (Typical).
Low Supply-Current Drain Independent of Supply Voltage: 0.8 mA (Typical), Low Output Saturation Voltage, Common-Mode Input Voltage Range Includes Ground.
Low Input Bias Current: 25 nA (Typical), Low Input Offset Voltage: 2 mV (Typical), Low Output Saturation Voltage.
Example Applications: Industrial, Automotive: Infotainment and Clusters, Body Control Modules, Power Supervision, Oscillators, Peak Detectors, Logic, Voltage Translation.

Four independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages.
Wide Supply Ranges Single Supply: 2 V to 36 V, Dual Supplies: ±1 V to ±18 V, Differential Input Voltage Range Equal to Maximum-Rated Supply Voltage: ±36 V, Low Input Offset Current: 3 nA (Typical).
Low Supply-Current Drain Independent of Supply Voltage: 0.8 mA (Typical), Low Output Saturation Voltage, Common-Mode Input Voltage Range Includes Ground.
Low Input Bias Current: 25 nA (Typical), Low Input Offset Voltage: 2 mV (Typical), Low Output Saturation Voltage.
Example Applications: Industrial, Automotive: Infotainment and Clusters, Body Control Modules, Power Supervision, Oscillators, Peak Detectors, Logic, Voltage Translation.

Four independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages.
Wide Supply Ranges Single Supply: 2 V to 36 V, Dual Supplies: ±1 V to ±18 V, Differential Input Voltage Range Equal to Maximum-Rated Supply Voltage: ±36 V, Low Input Offset Current: 3 nA (Typical).
Low Supply-Current Drain Independent of Supply Voltage: 0.8 mA (Typical), Low Output Saturation Voltage, Common-Mode Input Voltage Range Includes Ground.
Low Input Bias Current: 25 nA (Typical), Low Input Offset Voltage: 2 mV (Typical), Low Output Saturation Voltage.
Example Applications: Industrial, Automotive: Infotainment and Clusters, Body Control Modules, Power Supervision, Oscillators, Peak Detectors, Logic, Voltage Translation.